Reaction colors for card entry box

Hello @tessr, 

Please review the following commits I made in branch 'input-reactions'.

0896e87b612d7714dba36682c9bdfaafdc474669 (2013-07-23 20:38:45 -0700)
Change card color based on reaction (detected on keyup)

8cec5a377c310abb88656160614e708a0aebb269 (2013-07-23 20:37:57 -0700)
Refactored reaction-detection to a shared helper method

190c23f54835ec309c7b9705ac596a630e9fb3d1 (2013-07-23 20:37:18 -0700)
Bigger input field text; color transitions on the input card


R=@tessr
VISIBLE_CHANGES=Reaction colors for card entry box