[testing] Replace `tests :after_created` callback with the Bacon way.

Related to:
* https://github.com/HipByte/RubyMotion/pull/96
* https://hipbyte.freshdesk.com/helpdesk/tickets/1362
we require 10.8.4 since we rely on Xcode 5
Merge branch 'refs/heads/HipByte/master' into japanese

Conflicts:
	articles/testing/index.txt
	guides/getting-started/index.txt