[JRO] Remove multitenancy

Multi-tenancy is a little too tightly coupled and is a rarely used
feature. This is especially unecessary when considering this will soon
be extracted to an engine and the parent app should/could handle the
multi-tenancy on its own.

* Change site to app_config
* Get all specs passing
* Cucumber features all passing
* Move user profile cuke feature into capybara
* Clean up routes a little bit
* Move necessary js files to vendor