API parameter 'userID' is now used in join urls.

refs #721
Fixed things related to userID parameter.

refs #721
Merge branch '721-use-parameter-user-id' of git://github.com/gmiotto/bigbluebutton_rails into gmiotto-721-use-parameter-user-id

Conflicts:
	app/controllers/bigbluebutton/rooms_controller.rb
	spec/controllers/bigbluebutton/rooms_controller_spec.rb
A few more tests for userID and createTime on join calls

refs #721
Merge PR #17 of 'gmiotto:721-use-parameter-user-id'