Google Place Automplete, Proposal Detail Page - Jan18

Includes general location auto-complete plus proposal detail page changes:

* making autocomplete generally available and beginnings of a way to post navbar search form, plus location db-related changes to the UI
* first pass of proposal detail page changes complete, saving improvements and votes will be done after schema change
* restructures top of page to better show user who made the proposal and the corresponding vote comment, while removing that user from the Supporters list
* includes sort related proposals affordance
* accounts for when only support vote is from proposer