Refs #12. Fixing dd to dms converter.

This necessitated adjusting the tuple, so the other convert needed to 
be fixed as well. Also, added unit tests.
Refs #12. Changing test module name.
Refs #12. Adding rename test module.
Refs #12. Fixing formatting function and adding unit tests.
Refs #12. Adjusting tuple for degrees,minutes,sign.
Merge pull request #15 from mareuter/12_fix_negative_librations

12 fix negative librations