Conpherence - make the JS layer a bit better
Summary: this diff tries to polish the poo out of the JS layer while achieving fixes T3157 accolades.
Test Plan: introduced sleeps in the various controllers and clicked about. verified good "loading" UI in the menu / message / widget section as appropros. Loaded up in device size and resize and desktop sized and resized and all was good.
Reviewers: epriestley
Reviewed By: epriestley
CC: chad, aran, Korvin
Maniphest Tasks: T3164, T3157
Differential Revision: https://secure.phabricator.com/D6069