Update to README document

README document updated to reflect the means by which SP.COM credentials
may be added to the application
Updated Data Model to include License Type

License Type has been added to the data model for this application.
LicenseType can be added and viewed

Catalog Entry and Purchase Record now include new License Type.
Controllers have been adjusted to facilitate this, and a new
LicenseTypeService class has been added to deal with provisioning
license types for use in defining and viewing catalog entries.
Updated views to reflect LicenseType inclusion

Views affected that require display of LicenseType for catalog entries
have been updated accordingly.
CSS file has been altered to display a dropdownlist in a similar style
as all other data entry fields.