sass-rails 5.0 deprecated those

* prevent default event in JS handlers to prevent jumping back to the
  top.
* Use js-routes
* Use sprite for icons
* Reply with 200 instead of 204 when destroying a participation,
  to prevent errors in the browser console.

related to diaspora/jsxc#81

tests for reshares

Changelog.md update

fixing a style issue

removed unnecessary semicolon

Add #clear_account! disable mail spec

Add migration for disabling mail for all closed accounts

Change migration to use #update_all for disable_mail attribute

Add #clear_account! false fields spec