add activeadmin gem
initial set up of active admin

using stevenwu's example - thanks :)
Fix active_admin assets overriding app assets

Conflicts:
	Gemfile.lock
remove original assets
Add ActiveAdmin resoures for Auction, Reward, and User
Fix pry gem warning
Merge pull request #10 from Dawenster/jmondo/active-admin

Jmondo/active admin