[SASL-60] Deleting forked code from the SASL project.
[SASL-60] Disabling the test as there is no longer a mechanism in the project for the test to execute against.

Once an implementation is available this test should be re-enabled / tweaked to verify existing behaviour is restored.
[SASL-61] Switch the license to Apache 2.0
[SASL-61] Add the full license text to the project.
[SASL-48] Test case for the GSSAPI mechanism.
[SASL-45] Add a clean implementation of the GSSAPI mechanism as defined by RFC4752

This change also includes interoperability testing agains the JDK supplied versions.
[SASL-45] Correction to comma separated string splitting, also restore the two method forms for CallbackHandling to allow a mechanism to choose to handle the UnsupportedCallbackException itself.
[SASL-45] Add trace level logging to allow diagnostics relating to GSSAPI based authentication.