* Adds two models to the v2.0 spec, uses examples as defaults in python client
* Adds array default and type_holder_default and type_holder_example tests
* Re-generated python security client with ./bin/security/python-petstore.sh
* Changes comment text, rebased master
* Updates client + server samples
* Adds missing samples updates
* Changes python client to look for true or false with booleans in toDefaultValue
* Changes boolean casting to use Boolean.valueOf
* Adds deserialization fix for python tests
* Changes Mock to namedtuple in python deserialization tests
* Actually remove unittest.mock
