remove wrong end input tag
 intial implementation of markers
add marker events
Merge pull request #530 from sunglim/fix_wrong_end_input_tag

remove wrong end input tag
Formally endorse initActivitySpinner() in spark_polymer.dart
Slightly improve styling of the dialogs
Merge pull request #541 from dart-lang/devoncarew_exception_fix

fix a StateError in file_controller.dart when changing selection
working on grind deploy
Make 'grind.cmd release' work from Windows
block grind release on Windows
error message for pub get
Merge pull request #547 from sunglim/grind_err_msg

error message for pub get
remove path related function from utils.dart
feedback for remove path patch
Merge pull request #548 from sunglim/remove_path_util

repalce path related functions in utils.dart with 'package:path'
Merge pull request #544 from dart-lang/devoncarew_lines

working on grind deploy
Redo backdrop show/hide in a polymorphic way
Merge pull request #549 from ussuri/follow-up-to-517

Redo backdrop show/hide in a polymorphic way
Got both debugging the uncompiled app and `grind deploy` to work
Address comments