Merge pull request #65 from johnheroy/master

Start test suite for file format
fixed corrupting xlsx issue
Merge pull request #69 from NickStefan/master

fixed corrupting xlsx issue
git functions
Merge pull request #70 from doublelift/master

git functions
renderSheet view function added
Merge pull request #72 from NickStefan/master

renderSheet view function added
remove default feed
refactor sidebar to only show snapshot history
console.log commits on file open
remove auto feed
fill snapshot history on open
remove green dot near author name
clear list before appending commits
Merge pull request #74 from doublelift/master

checkout git history on file open
add img directory to assets
move /css to /assets
move /fonts to /assets
update gulpfile for new css path
update script paths for new css dir