Merge pull request #941 from dart-lang/verbose-help

Add "--verbose" to "--help" and hide most options normally.
diff --git a/.test_config b/.test_config
deleted file mode 100644
index 531426a..0000000
--- a/.test_config
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "test_package": {
-    "platforms": ["vm"]
-  }
-}
\ No newline at end of file