Lisiting participants on board index page

Hello @tessr, 

Please review the following commits I made in branch 'prezjordan-board-participants'.

31355e3b0ef363875b33192e598500609981bf1a (2013-07-28 18:48:52 -0700)
Lisiting participants on board index page

07c744045108f46d3cd3e1ada29d14a139796774 (2013-07-28 18:37:40 -0700)
Method to extract the participants of a given board

639616ace6cc495e2ba1030e6ef1b36b7fe81f5a (2013-07-28 18:34:20 -0700)
ID fix in user-builder

581e9569d2cd9e70763040375010f0d774d9fcf4 (2013-07-28 18:14:46 -0700)
Added underscore


R=@tessr
VISIBLE_CHANGES=Lisiting participants on board index page