Exceptions Handlers, Test Updates, Tokens

Implements encryption/decryption for api tokens - secret key set in jumpgate.conf- Resolves #21
Implements Validate Token Endpoint - Resolves #22
Adjusts tempest tests to be up-to-date with tempest master (lots of renames and some removed tests)
Uses Falcon's New Exception Handler
Adds missing pycrypto requirement
Moves Error handler for ResponseException to ResponseException
Improves logging of unexpected error (removes print statement)
Merge pull request #23 from sudorandom/update-1

Exceptions Handlers, Test Updates, Tokens