removed set_email and update_email from actions, they were removed eons ago.
removed unsubscribe_update and request_update also removed long ago
added protected method only_admin to make default policies simpler
added update_password to actions list
added user policy to the project
migrated users controller to pundit
removed cancan user abilities
uservoice_gadget won't need any privilege
migrated user views to pundit
added published_at into channel_posts
channel posts texts adjusts
remove unpublish action
Merge pull request #560 from diogob/migrate_users_to_pundit

Migrate users to pundit
change position of advise
text adjusts
adjusts spacing
style adjusts [Fix #59244802]
last fix on admin posts
instance @channel does not exists anymore instead we use channel helper [Fix #65495298]
need to use contributions table and not the backers [Fix #65491192]