Friendlier new conversation mobile

[WIP] aspect membership dropdown Backbone.js rework

Update gems

* initial backbone port
* changed AspectMembershipsController#destroy to use aspect_membership_id
* included rudimentary jasmine specs
* more specs, updating the list elements after de-/selection
* update selected aspect count on button
* don't even try to render html in AspectMembershipsController
* more specs for button summary text
* adapt aspect management on contacts page and in the popup boxes
* adapt inline creation of aspects + memberships

TODO
* more tests

Revert "Merge pull request #3968 from marpo60/limit_shareable_from_person_queries"

This reverts commit ddfc558a.
This reverts commit 30ed4b4e, reversing
changes made to f50ce2cb.

limiting the fetch of the IDs breaks paginating, there's no quick way to fix that

I left the spec in for future use.

Not ordering the IDs caused incorret ones returned

The spec is totally at the wrong level but I couldn't make
something up that exposed the bug at a deeper level :(