Created DiagramParser as an 'Adapter' to both Encore files and XMI files
to extract Class Diagram information from the files.
1. Completed creating Factory pattern classes and stub methods for
DiagramParser.

2. Created new enum - DiagramType.

3. Currently the file type is being saved in the DiagramType column in
the database, this should re-mapped. Initiated changes in UploadServlet
to not have build errors.
Added PolicyLevelType enum
Merge pull request #32 from ahajirnis/DiagramParser

Diagram parser