Partly based on Yammer - Larger font, Liquid layout (http://freestyler.ws/style/40104/yammer-larger-font-liquid-layout)

Versions
1.0.8 Bolded group name in message thread
1.0.7 Colored Date of last post in thread
1.0.6 Colored Date of first post in thread
1.0.5 NO SHOUTING PLEASE (Like, Reply, Share buttons)
1.0.4 Added a dotted bottom border to distinguish threads
1.0.3 Reduced space between groups in left column
1.0.2 Main column header wider; adjusted for 1920x1080 screens when vertical split
1.0.1 Reduced space between items
1.0.0 First.