Deal with already-installed ctypesgen
Version 0.2.5
Remove the GSS_ prefix from constants
Add support for delegated credentials in AcceptCtx

Add support for inquiring mechs for a credential.

Make OIDSet immutable and factor out add() into MutableOIDSet, this allows returning the same instance of OIDSet from BaseCredential.mechs
Add some TODO notes
Build improvements

Use GSS.framework if it exists on Mac.
Don't fail if krb5-config doesn't exist.
Allow returning a context token along with GSSException

In case context establishment fails, but the mechanism wants to send a
final token to the other end.
Version 0.3.0