diff --git a/.travis.yml b/.travis.yml
index 7fe752e..3c087ca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,10 @@
 language: dart
+dart:
+  - dev
 script: ./tool/travis.sh
 dist: trusty
 sudo: false
+
+branches:
+  only:
+    - master
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 372cddd..338c92c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.1.3
+- In verbose mode, instead of printing the diff from the last log message,
+  print the total time since the tool started
+- Change to not buffer the last log message sent in verbose logging mode
+- Expose more classes from the logging library
+
 ## 0.1.2+1
 
 - Remove unneeded change to Dart SDK constraint.
diff --git a/example/main.dart b/example/main.dart
index 0cc6846..71c0156 100644
--- a/example/main.dart
+++ b/example/main.dart
@@ -21,5 +21,4 @@
   progress.finish(showTiming: true);
 
   logger.stdout('All ${logger.ansi.emphasized('done')}.');
-  logger.flush();
 }
diff --git a/lib/cli_logging.dart b/lib/cli_logging.dart
index 2da62ca..9646cd6 100644
--- a/lib/cli_logging.dart
+++ b/lib/cli_logging.dart
@@ -23,12 +23,19 @@
   Ansi(this.useAnsi);
 
   String get cyan => _code('\u001b[36m');
+
   String get green => _code('\u001b[32m');
+
   String get magenta => _code('\u001b[35m');
+
   String get red => _code('\u001b[31m');
+
   String get yellow => _code('\u001b[33m');
+
   String get blue => _code('\u001b[34m');
+
   String get gray => _code('\u001b[1;30m');
+
   String get noColor => _code('\u001b[39m');
 
   String get none => _code('\u001b[0m');
@@ -55,10 +62,14 @@
 /// standard status messages, trace level output, and indeterminate progress.
 abstract class Logger {
   /// Create a normal [Logger]; this logger will not display trace level output.
-  factory Logger.standard({Ansi ansi}) => new _StandardLogger(ansi: ansi);
+  factory Logger.standard({Ansi ansi}) => new StandardLogger(ansi: ansi);
 
   /// Create a [Logger] that will display trace level output.
-  factory Logger.verbose({Ansi ansi}) => new _VerboseLogger(ansi: ansi);
+  ///
+  /// If [logTime] is `true`, this logger will display the time of the message.
+  factory Logger.verbose({Ansi ansi, bool logTime: true}) {
+    return new VerboseLogger(ansi: ansi, logTime: logTime);
+  }
 
   Ansi get ansi;
 
@@ -75,9 +86,9 @@
 
   /// Start an indeterminate progress display.
   Progress progress(String message);
-  void _progressFinished(Progress progress);
 
   /// Flush any un-written output.
+  @Deprecated('This method will be removed in the future')
   void flush();
 }
 
@@ -86,7 +97,7 @@
   final String message;
   final Stopwatch _stopwatch;
 
-  Progress._(this.message) : _stopwatch = new Stopwatch()..start();
+  Progress(this.message) : _stopwatch = new Stopwatch()..start();
 
   Duration get elapsed => _stopwatch.elapsed;
 
@@ -97,10 +108,10 @@
   void cancel();
 }
 
-class _StandardLogger implements Logger {
+class StandardLogger implements Logger {
   Ansi ansi;
 
-  _StandardLogger({this.ansi}) {
+  StandardLogger({this.ansi}) {
     ansi ??= new Ansi(Ansi.terminalSupportsAnsi);
   }
 
@@ -109,67 +120,68 @@
   Progress _currentProgress;
 
   void stderr(String message) {
+    if (_currentProgress != null) {
+      Progress progress = _currentProgress;
+      _currentProgress = null;
+      progress.cancel();
+    }
+
     io.stderr.writeln(message);
-    _currentProgress?.cancel();
-    _currentProgress = null;
   }
 
   void stdout(String message) {
+    if (_currentProgress != null) {
+      Progress progress = _currentProgress;
+      _currentProgress = null;
+      progress.cancel();
+    }
+
     print(message);
-    _currentProgress?.cancel();
-    _currentProgress = null;
   }
 
   void trace(String message) {}
 
   Progress progress(String message) {
-    _currentProgress?.cancel();
-    _currentProgress = null;
+    if (_currentProgress != null) {
+      Progress progress = _currentProgress;
+      _currentProgress = null;
+      progress.cancel();
+    }
 
     Progress progress = ansi.useAnsi
-        ? new _AnsiProgress(this, ansi, message)
-        : new _SimpleProgress(this, message);
+        ? new AnsiProgress(ansi, message)
+        : new SimpleProgress(this, message);
     _currentProgress = progress;
     return progress;
   }
 
-  void _progressFinished(Progress progress) {
-    if (_currentProgress == progress) {
-      _currentProgress = null;
-    }
-  }
-
+  @Deprecated('This method will be removed in the future')
   void flush() {}
 }
 
-class _SimpleProgress extends Progress {
+class SimpleProgress extends Progress {
   final Logger logger;
 
-  _SimpleProgress(this.logger, String message) : super._(message) {
+  SimpleProgress(this.logger, String message) : super(message) {
     logger.stdout('$message...');
   }
 
   @override
-  void cancel() {
-    logger._progressFinished(this);
-  }
+  void cancel() {}
 
   @override
-  void finish({String message, bool showTiming}) {
-    logger._progressFinished(this);
-  }
+  void finish({String message, bool showTiming}) {}
 }
 
-class _AnsiProgress extends Progress {
+class AnsiProgress extends Progress {
   static const List<String> kAnimationItems = const ['/', '-', '\\', '|'];
 
-  final Logger logger;
   final Ansi ansi;
 
   int _index = 0;
   Timer _timer;
 
-  _AnsiProgress(this.logger, this.ansi, String message) : super._(message) {
+  AnsiProgress(this.ansi, String message) : super(message) {
     io.stdout.write('${message}...  '.padRight(40));
 
     _timer = new Timer.periodic(new Duration(milliseconds: 80), (t) {
@@ -185,7 +197,6 @@
     if (_timer.isActive) {
       _timer.cancel();
       _updateDisplay(cancelled: true);
-      logger._progressFinished(this);
     }
   }
 
@@ -194,7 +205,6 @@
     if (_timer.isActive) {
       _timer.cancel();
       _updateDisplay(isFinal: true, message: message, showTiming: showTiming);
-      logger._progressFinished(this);
     }
   }
 
@@ -222,52 +232,55 @@
   }
 }
 
-class _VerboseLogger implements Logger {
+class VerboseLogger implements Logger {
   Ansi ansi;
+  bool logTime;
   Stopwatch _timer;
 
-  String _previousErr;
-  String _previousMsg;
-
-  _VerboseLogger({this.ansi}) {
+  VerboseLogger({this.ansi, this.logTime}) {
     ansi ??= new Ansi(Ansi.terminalSupportsAnsi);
+    logTime ??= false;
+
     _timer = new Stopwatch()..start();
   }
 
   bool get isVerbose => true;
 
-  void stderr(String message) {
-    flush();
-    _previousErr = '${ansi.red}$message${ansi.none}';
+  void stdout(String message) {
+    io.stdout.writeln('${_createPrefix()}$message');
   }
 
-  void stdout(String message) {
-    flush();
-    _previousMsg = message;
+  void stderr(String message) {
+    io.stderr.writeln('${_createPrefix()}${ansi.red}$message${ansi.none}');
   }
 
   void trace(String message) {
-    flush();
-    _previousMsg = '${ansi.gray}$message${ansi.none}';
+    io.stdout.writeln('${_createPrefix()}${ansi.gray}$message${ansi.none}');
   }
 
-  Progress progress(String message) => new _SimpleProgress(this, message);
+  Progress progress(String message) => new SimpleProgress(this, message);
 
-  void _progressFinished(Progress progress) {}
+  @Deprecated('This method will be removed in the future')
+  void flush() {}
 
-  void flush() {
-    if (_previousErr != null) {
-      io.stderr.writeln('${_createTag()} $_previousErr');
-      _previousErr = null;
-    } else if (_previousMsg != null) {
-      io.stdout.writeln('${_createTag()} $_previousMsg');
-      _previousMsg = null;
+  String _createPrefix() {
+    if (!logTime) {
+      return '';
     }
-  }
 
-  String _createTag() {
-    int millis = _timer.elapsedMilliseconds;
-    _timer.reset();
-    return '[${millis.toString().padLeft(4)} ms]';
+    double seconds = _timer.elapsedMilliseconds / 1000.0;
+    int minutes = seconds ~/ 60;
+    seconds -= minutes * 60.0;
+
+    StringBuffer buf = new StringBuffer();
+    if (minutes > 0) {
+      buf.write((minutes % 60));
+      buf.write('m ');
+    }
+
+    buf.write(seconds.toStringAsFixed(3).padLeft(minutes > 0 ? 6 : 1, '0'));
+    buf.write('s');
+
+    return '[${buf.toString().padLeft(11)}] ';
   }
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index d7ee512..d274ae6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: cli_util
-version: 0.1.2+1
+version: 0.1.3
 author: Dart Team <misc@dartlang.org>
 description: A library to help in building Dart command-line apps.
 homepage: https://github.com/dart-lang/cli_util
diff --git a/tool/travis.sh b/tool/travis.sh
index 0b0aef9..59a283c 100755
--- a/tool/travis.sh
+++ b/tool/travis.sh
@@ -15,6 +15,9 @@
 # Run the tests.
 dart test/cli_util_test.dart
 
+# Ensure we can run in Dart 2.
+dart --preview-dart-2 example/main.dart
+
 # Install dart_coveralls; gather and send coverage data.
 if [ "$COVERALLS_TOKEN" ]; then
   pub global activate dart_coveralls