add more preferences tests
merge to master; change save frequency to 6 seconds
adding editors.dart
Save/restore splitview position (fixed #203)
Add pack index test.
Merge pull request #204 from dinhviethoa/203-prefs-splitview-position

Save/restore splitview position (fixed #203)
merging in CLs; added auto-saving
Addressed comments.
Merge pull request #205 from dart-lang/add_test_for_pack_index

Add pack index test.
More work on ObjectStore.
Add dummy test git repository.

Add dummy test for objectstore.
Add writeObjecrt method in objectstore.
Add writeTree method to objectstore.
add tracking for actions and uncaught exceptions
fix a warning and add a question
Merge pull request #197 from dart-lang/preferences-work

add more preferences tests
cleaning up todos
implement delete file
Cleanup objectstore test.
fixed change tracking issue; added tests