Fuel UX Datagridview
adding necessary gems underscorejs, fuelux-rails, gon
using gon in accounts, credits controller
all necessary js for datagridview
fuelux setup in app.haml, js, bootstrap_and_overrides
update TODO
fix specs
use the variables created in the callback
using the jbuilder with gon
format amount and purchase date
Merge branch 'fuel'