Remove unused imports.
Draft a view in Enabler to send a diagnostic request.
Hook up "Send" button for diagnostic requests in Enabler. Works!
Display last diagnostic request sent from Enabler view.
Fix display of received diag responses in Enabler.

It's currently using an adapter based on the key, so you only see the
latest response for each key. This might be OK, or we might need to have
more of a running timeline of all responses received.
Display a label above list of diag responses in Enabler.
Display all diag responses in sequential order.
Improve looks of the diag request page marginally.
Merge pull request #160 from openxc/diagnostic-request-fragment

Add a view to send a diagnostic request to the Enabler