refs #809
Logic is done.
Next step is create some tests for the application_controlller.
refs #809
Created tests for function bigbluebutton_can_create?
I'll do some tests for the route as well, depending on what data the user inputs on form.

cherry-pick aa364f388a

Conflicts:
	spec/factories/bigbluebutton_room.rb
refs #809
created tests for the bbb room controller
checks if the user can start a meeting or not depending if he's the owner or not of that room

cherry-pick 4057a6e0e2
Refactor the tests for #809

The same tests, just reorganized.
Complements ef138b788e55 and bc709b9910.
Update bigbluebutton_rails, refs #809