* Removes future from python-exp v3 sample
* Removes future from python-exp v2 sample
* Deletes future from remaining python-exp files
* Removes six from python-exp templates
* Removes six from python-exp samples
* Removes mock from python-exp
* Python-exp switched to py3
* Removes python 2.7 for python-exp ci testing
* Requires python>=3.3 for python-exp
* Reverts unnecessary changes to two templates
* Use AttributeError instead of ApiKeyError because that's what the hasattr builtin function uses
* Use AttributeError instead of ApiKeyError because that's what the hasattr builtin function uses
* fix unit tests
* create ApiAttributeError exception
* fix formatting
* run samples scripts
* Adds composed model support for allOf oneOf anyOf
* Moves discriminator into discriminator() class method, adds test_deserialize_lizard, adds setting discriminator using allOf schema
* Adds python-experimental generator
* Adds python-experimental samples folder which uses its own v2 spec
* Adds enusre-up-to-date updates
* Removes samples/client/petstore/perl/t/AnotherFakeApiTest.t
* Removes comment line from python-experimental generator
* Reverts perl docs file
* Updates perl sample client
* Adds python-experimental to pom.xml
* Copies the python test foldeers tests and testfiles into python-experimental
* Copies python test folder into python-experimental
* Moves python testing from Travis (samples pom.xml profile) to Circlci (samples.circleci pom.xml profile)
* Adds python-experimental pom.xml
* Adds python-experimental makefile and .sh files
* Chenges python-experimental to use gitignored venv rather than .venv which is not ignored when testing
* Adds dev-requiremnts.txt and removes .travis.yml from python-experimental so CI tests will pass
* Moves python-experimental from CicleCI to Travis to get support for multiple python environments
* Updates generator java comment so CI tests will run over again
