Added support for for ignored features mentioned by PTOptions

- See http://en.opensuse.org/SDB:Linuxrc#p_ptoptions for docu
- See http://en.opensuse.org/index.php?title=SDB:Linuxrc&oldid=63298#p_ignore_features
Adapted build requirements
Added changes file entry and increased version
Changed according to comments from review
Removed some test that are also below
Removed test that test mocked API

- tests just mocking which is not needed
Added helpful message to RSpec output
Merge pull request #81 from kobliha/ptoptions_support

Extended support for ignored_features