Bugfixes for editor.

* Save button now triggers a git status call, updating the statuses of modified files.
* An added and modified file is not colored blue in the
  file tree.
* Fixed [Object object] error on server, resulting from null output from custom git command.
Merge branch 'master' of github.com:CSC495-2014/TeamworkEnglewoodGit
Merge pull request #145 from apotheos/master

Bugfixes for Editor