OPEN - task 31: Maine Transcript (2013 and later) - Transcript report should check credit waivers 

https://github.com/maine207/aspen/issues/issues/issue/31
Changed parseReqWaiverXml(String) so that it actually parsed the XML
string using an XML parser. The previous version (written by Aspen) did
not correctly parse the XML string. This was masked by the fact that the
courses being checked may have fulfilled multiple graduation
requirements.