Save input in autocomplete

* Input is saved when user clicks off autocomplete field
* Input is cleared when value is selected

https://trello.com/c/nzoXDuRl
App sharing modals allow for sharing with an indiviudal group

* Remove ability for user to share the app with multiple groups
* This setup is closer to the sharing capability allowed by the Yammer embed widget
* Remove unused Yammer api methods
* Remove logic that tracks if a user has shared the app post vote since the modal is now delayed until 45 seconds post vote

https://trello.com/c/BevzcF5T
https://trello.com/c/5aFF2lBs
Remove view_context from controllers

* Mix in necessary helpers to negate need for view_context
* More info: http://apidock.com/rails/AbstractController/Rendering/view_context

https://trello.com/c/3FELdLxh
Update binding_of_caller gem

* Version 0.6.9 was yanked
* https://rubygems.org/gems/binding_of_caller/versions/0.6.9