Add region option to Rackspace

Stop using deprecated rackspace_endpoint option
Use super() instead of super to run tests on c-ruby

jruby and c-ruby raise different exception messages
Disable specs in spec_helper instead of Rakefile

Use :disabled instead of :skip
Add find and update tasks for Rackspace

Finds servers by name and sets the context fields in the composition as if it was just started as part of it
Update server names