added overflow to all ul's for clearing floats
changed to fixed width for desktop
removed bottom margin on last child for item lists
created visual division between the two contributions lists
added more icons to fontello
changed code to use compass
styles for contributions page
changed width of "features" copy div
changed content divs on contributions page to their respective appropriate widths
created mixin for action buttons
styled new thread button
changed position of the thread type buttons
misc styles