Update to latest upstream release (RHBZ #1108177)
    
    - Remove gem2rpm auto-generated comment
    - Update URL to latest upstream location
    - Add generate-test-tarball.sh script since upstream no longer ships the tests
    - Adjustments for https://fedoraproject.org/wiki/Changes/Ruby_2.1
    - Use gem unpack / setup / build per Ruby packaging guidelines
    - Use %license tag