WIP:    Flow manager journal icons

This feature is close to complete, but still WIP. 2 tests have been written that are meant to be failing at the moment (below).  When the flow manager can show the Journals per column, the tests will pass.

Failing Build:
https://semaphoreapp.com/tahi-project/tahi/branches/flow-manager-journal-icons/builds/4

The VCR spec failure needs to be looked at, but was passing locally. The other 2 test failures are by design (per above).

To get this feature over the edge, the Journal logo needs to be made available to the /flow_manager, which appeared to be a bit trickier than first expected. 

Currently, the Ember model in use is `user_flows`.   We're considering passing `flows` down with the `user_flows` serialized json, then access it in this order - `user_low.flow.journal.logo`.