Disabled validation of article xml, storing article xml as a datastream, other behavior adjustments and bug fixes in BioMed extras job.  Added unit tests for DSpace METS job and BioMed extras.  Abstracted helper functions out into a parent test class
Added test for BioMedArticleHelper.  Removed author cleanup from normalization to helper, and can now start from an existing mods document rather than transfering elements
Merge pull request #128 from UNC-Libraries/biomed-tests

Biomed normalization updates, Biomed/DSpace tests