Begin Implementation of Factory Girl for testing.

Add to Gemfile
Add to specs
Merge branch 'master' of github.com:CTA/PS into kcollette
Implement factories, add tests, implement fixes

Add new factories.
Add new tests.
Implement bug fixes via working with tests.
Merge branch 'kcollette' of github.com:/CTA/PS into experiment

Conflicts:
	lib/ps/psobject.rb
	lib/ps/response.rb