Added rake and rspec for tests to the development dependencies.
Parses key words correctly that contain more than just letters and digits

The specification allows way more characters.
"rake test" now works, too
More complex fixture for testing multi-line values
Removed else case that handles unexpected line.

Thinking... throwing an exception might be saner.
Renamed spec test so that "rake test" finds it.
Added fixture for Packages
Make build dependencies versioned