finish up work to implement vim and emacs key bindings
merge to master
Add objectStore test.
Fix git object bugs.
Add more checks and cleanup.
Hide .git folders
Merge pull request #281 from dinhviethoa/278-hide-git

Hide .git folders (Fixed #278).
merge to master; upgrade ace
Merge branch '278-hide-git' of https://github.com/dinhviethoa/spark
Merge branch 'test-objectstore' of https://github.com/dart-lang/spark
comments.
Merge pull request #275 from dart-lang/test-objectstore

Test objectstore
Remove 'git prefix from files in git folder.
Merge pull request #284 from dart-lang/reorg-git-files

Remove 'git prefix from files in git folder.
Move git tests files to git/ folder.
Merge branch 'move_git_tests' of https://github.com/dart-lang/spark