Fix for #50 (Dashboard Re-Skin: Users > Groups > Edit Group Permissions)

Wasn't sure on the type of btn to use. Not really dangerous, but shouldn... ...'t be success either. Warning?
If you'd rather it be something else, lemme know and I'll quickly repush.

Fix for #50 

Screenshot: 

Warning (as I pulled): http://puu.sh/a3yDH/5ff0718c00.png
Danger: http://puu.sh/a3yFX/7d9c8d3138.png