changing
Adding util function for retrieve data types from the db
Moving data_type_id from prep template to raw_data
Updating the RawData object to reflect the changes on the DB
Fixing commands to pass the RawData data_type as a parameter
Changing the metadata template tests for the change on the DB
Fixing the data type retrieval for study obj
Latest changes to the change on the DB
Merge branch 'master' of github.com:qiime/QiiTa into data_type_change
Merge pull request #386 from josenavas/data_type_change

BLOCKER!! Data type change