Allow {Class,Method}Generator.process() to throw CannotCompileException

This exception is naturally thrown by Javassist, so allowing our users
to not encapsulate it is a Good Thing.

Change-Id: Ibc558501e799a2c4c6599d6d7c5da668335c7270
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Allow {Class,Method}Generator.process() to throw CannotCompileException"