Changed id parameter to mandatory.
Re-added menu option.
Fixed docs.
Added permissions to activities.
Fixed activity provider.
Save only user id into storage.

After implementing sessions user retrieval for /auth
has to be fixed to return only user id.

Now it fetches user info by stored id when needed.
Added permissionsProvider and changed activityProvider to use it.
Removed debug code.
Merge remote-tracking branch 'ozan/activity-provider-update'