Add delimiters parameter to Template interface, and fix test

lib/mustache.dart

diff --git a/lib/mustache.dart b/lib/mustache.dart
index 4a6ca6f..70fa97d 100644
--- a/lib/mustache.dart
+++ b/lib/mustache.dart
@@ -9,7 +9,7 @@
 Template parse(String source, {bool lenient : false})
   => new Template(source, lenient: lenient);
 
-/// A Template can be efficienctly rendered multiple times with different
+/// A Template can be efficiently rendered multiple times with different
 /// values.
 abstract class Template {
 
@@ -21,8 +21,9 @@
       {bool lenient,
        bool htmlEscapeValues,
        String name,
-       PartialResolver partialResolver}) = t.Template.fromSource;
-  
+       PartialResolver partialResolver,
+       String delimiters}) = t.Template.fromSource;
+
   String get name;
   String get source;
   

test/mustache_test.dart

diff --git a/test/mustache_test.dart b/test/mustache_test.dart
index 10c5fff..f569bb1 100644
--- a/test/mustache_test.dart
+++ b/test/mustache_test.dart
@@ -643,8 +643,7 @@
   group('Template with custom delimiters', () {
     test('Basic', () {
       var t = new Template('(<%text%>)', delimiters: '<% %>');
-      var val = t.renderString(model);
-      
+      var val = t.renderString({'text': 'Hey!'});
       expect(val, equals('(Hey!)'));
     });
   });