Refactored code to allow more flexibility in parsing the results from
CAS before handing off control back to Shib.

Fixed a bug that made it possible to get multiple
EntityIdParamaterBuilders (thus multiple copies of the parameter in the
request)
Updated the version
Refactored the code to support allowing extensions to the CAS to SHIB
data translation. 

Fixed an issue where the EntityId was getting into the parameter list
multiple time.
Merge pull request #5 from Unicon/callbackServletExp

Refactored code to allow more flexibility in parsing the results from CAS. Fixed a bug where EntityId was appearing in the parameters of the request multiple times