BatchConnect::App#from_token not being cached

[johrstrom]

We solved #210 by caching applications in the Router classes that provide them.

However, this method below still initializes these objects outside of the Rails cache.

ondemand/apps/dashboard/app/models/batch_connect/app.rb

Line 27 in a63ca81

def from_token(token)

This ticket is to find some way to unify all this and provide cached apps for any other page/functionality that needs it.