Major changes to support issues #41 and #56: Add artifacts for XSD va…

…lidation, modify templates for 'reserve' and 'draft' to conform to XSD, add config for XSD file, modify features files for 'behave' testing, modify steps.py to match feature verbiage, fix bug with input to 'release' to contain URN instead of URL, add XSD validation to 'draft', 'release' and 'reserve', fix reserve_test.py to conform to new parameters, remove date check with schematron from osti_input_validator.py as XSD would of caught it, add 'date_record_added' to DOI as XSD requires it, add function create_osti_doi_release_record to osti.py, add parsing of 'authors' field in osti_web_parser.py if found, add XSD valildation to doi_validator.py and fix bug with accesing 'doi' fields that are None, modify doi_xml_differ.py logic to handle 'id', 'date_record_added' and clean up print statements.