HUE-1348 [search] Improve collection dropdown

Restyled dropdown, improved placeholder and made action button more visible
[impala] Fix change of Editor name
HUE-1796 [dbquery] Interactive feedback when sumitting queries

Added feedback when submitting the query
Added collapse query panel to maximise the result screen estate
Fixed table extender plugin
HUE-1795 [core] Update window title on every page with a progress bar

Introduced jHueTitleUpdater
Added functionality to Pig, JB and Oozie
HUE-1219 [impala] One page app

Removing all the mako template logic and moving to front end.
Added APIs for Beeswax.
Moved a bunch of logic from wait_results.mako and watch_query.mako
to execute.mako.
Explain uses one API now.
Merge remote-tracking branch 'origin/HUE-1219-abe' into HUE-1219-abe