More work on ObjectStore.
Add dummy test git repository.

Add dummy test for objectstore.
Add writeObjecrt method in objectstore.
Add writeTree method to objectstore.
Cleanup objectstore test.
First attempt at spark-splitter: still not-working
Fix merging artifacts
Reconcile with updated non-Polymer UI
CSS adjustments to make at least the flexbox work
Build version 0.0.10
Fixed a typo/bug + added comments
Build version 0.0.11
Fix: icons weren't found without full path
Register event handlers for dragging
Add tests for git_util.

Addressed comments.
Fixed draggability (with bugs still)
re-enable chrome tests on drone.io
don't run tests on dart2js after all...
Merge pull request #206 from dart-lang/objectstore

More work on ObjectStore.
Add git_util test file.