adding rar archives as acceptable for map_wadfile + specs
[#22]
specs for map_wadfile validations and some neat attachment mocking method
[#22]
renamed mocked_file helper to mocked_attachment
[#22]
small refactors for factories
[#22]
dont forsee any specs for those
[#22]
specs for map_image with fixes and fixtures
Merge branch 'master' of github.com:ellmo/doomhub

Conflicts:
	spec/models/map_wadfile_spec.rb