Fixing file-type util lib
Adding test for file-typ
Using file-type lib for image file detection in client and server side
Adding helpful tooltips for various Ungit buttons.
Merge pull request #443 from codingtwinky/master

Consolidated file type check for both client and server side
Merge pull request #445 from codingtwinky/Tooltip_add

Adding helpful tooltips for various Ungit buttons.
Merge branch 'master' into #126

Conflicts:
	components/commitdiff/commitlinediff.js