Merge pull request #8 from g-weatherill/master

Removes old source_model_nrml04_parser.py - had already been replaced
Fixed imports following the new naming
Improved the testing of the Kijko and Sellevol method
Improved the testing of the Kijko and Sellevol method
Merge pull request #9 from GEMScienceTools/kijkotest

Improved tests for the Kijko and Sellevol method