Update ruby to 1.9.3-p484

The gem debugger was causing a few problems, so it was removed. It had not
been used for a long time.
Update bigbluebutton-api-ruby and bigbluebutton_rails
Add tests for 13017cd3

refs #1166
Fix spaces/index for anonymous users and adjust its visual

Made it look better and with more information for anonymous users.
Add signal in spaces/show when a user is member of the space

There was no easy way to tell if you were already member of the space you
were accessing or not. Added a small text in the page title.
Lots of improvements in join requests

Cleaned up the views and the controller.
Improved the messages shown to the user when dealing with join requests.

With this we are a bit further on improving the way join requests are shown
to the user, see #1067

refs #457, refs #1067