Uses rack-mini-profiler.
Some model validations. And makes sure no two users link the same
Coinbase account.
Displays linking status and balance in dashboard account summary.
Styling changes to dashboard modules
Merge branch 'mitchellgu-bitstation-app' of https://github.com/nelson-liu/BitStation-App into mitchellgu-bitstation-app

Conflicts:
	app/views/dashboard/dashboard.html.erb