CASLoginModule for JAAS applications

Attached is the source for a CASLoginModule that, when compiled and jarred with the standard CAS java client distribution source, enables drop-in CAS support for JAAS applications such as HyperContent 2.0 (b4 or later). The source code contains documentation on how to configure and use JAAS in your own applications as well.

This code will be included in a future release of the CAS Java Client distribution.