Infra to display login popup when not logged users click in a link
require_auth_to_comment: option to display login popup when click in post comment button
Display login popup when click to join a community
vote_plugin: display login popup when click on like/dislike
Merge branch 'AI3043-login_popup' into stable

Conflicts:
	app/views/layouts/application-ng.rhtml
Revert "add improvements to community track list block"

This reverts commit 2ca7bb1b28c76f70f07498c8288e44eb8e8764ba.
(Error on existing blocks)