Add jscs task + config

Hello @evansolomon, 

Please review the following commits I made in branch 'es-jscs'.

9f118b7a81ae78e5730c1d02e1f3dc19f0700d2f (2014-03-15 18:15:23 -0700)
Add jscs task + config
Also fix a couple jscs errors

R=@evansolomon