[Python] Adds new client generator, python-experimental (#3244)

* 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

samples/client/petstore/python-experimental/test_python2.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+REQUIREMENTS_FILE=dev-requirements.txt
+REQUIREMENTS_OUT=dev-requirements.txt.log
+SETUP_OUT=*.egg-info
+VENV=venv
+DEACTIVE=false
+
+export LC_ALL=en_US.UTF-8
+export LANG=en_US.UTF-8
+
+### set virtualenv
+if [ -z "$VIRTUAL_ENV" ]; then
+		virtualenv $VENV --no-site-packages --always-copy
+		source $VENV/bin/activate
+    DEACTIVE=true
+fi
+
+### install dependencies
+pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
+python setup.py develop
+
+### run tests
+nosetests || exit 1
+
+### static analysis of code
+flake8 --show-source petstore_api/
+
+### deactivate virtualenv
+#if [ $DEACTIVE == true ]; then
+#    deactivate
+#fi
+