Test for TodoMVC editor sample running on drone.io
This means it will show up at https://drone.io/dart-lang/web-ui

My previous change made TodoMVC's tests self-contained. Now I need to copy that into bleeding_edge SVN, and wait for it to get propagated released in a trunk. Until that happens it is treated as a warning if "test/test.dart" is missing.

Review URL: https://chromiumcodereview.appspot.com//12865008