First attempt to fix issue #16 (Unversioned files)

Implemented for git only.
First attempt to fix #16 (Show not tracked files)

For git only.
Merge branch 'master' of git://github.com/bradsokol/VcsGutter

Conflicts:
	.gitignore
	gutter_handlers.py
	vcs_gutter.py
Issue #16: Added hg support
SVN support for #16.