Changed class names to match CMS names

Interface Control Document lists Data Types for each field, changed
InsuredMember to EnrollmentEnrollee to match the document and prevent
confusion.
Removed some old XML generation code.

There were quite a few lines of code left over from earlier testing,
removed them and changed EnrollmentSubmissionsXmlGenerator so that it
takes an EnrollmentSubmission object and serializes it all at once.
Pharmacy Claims Submission XML Generation

Code to generate XML files for pharmacy claims submissions, including a
unit test to generate the sample XML file that CMS provided.