Renamed 'sprite-rsmb' to 'icon-sprite'
Changed '.github.alt' to '.git'
Fix for ms-gradient missing space
Removed outline from anchors and buttons on hover, focus, active states
Replaced box-shadow rgba value with a hex value
Added new foursquare logo and renamed old buttons to alternative buttons
Update of sprite source files
Updated the preview files to v.2.2.0
Merged v.2.2 into master