Add tox and travis support

.travis.yml

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+# ref: https://docs.travis-ci.com/user/languages/python
+language: python
+env:
+  - TOXENV=py36
+  - TOXENV=py35
+  - TOXENV=py34
+  - TOXENV=py27
+
+install:
+  - pip install tox
+
+script:
+  - tox
+

run_tox.sh

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+#!/bin/bash
+
+# Copyright 2017 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and 
+# limitations under the License.
+
+# Script to fetch latest swagger spec.
+# Puts the updated spec at api/swagger-spec/
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+RUNNING_DIR=$(pwd)
+TMP_DIR=$(mktemp -d)
+
+function cleanup()
+{
+  cd "${RUNNING_DIR}"
+#  rm -rf "${TMP_DIR}"
+}
+trap cleanup EXIT SIGINT
+
+
+SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")
+pushd "${SCRIPT_ROOT}" > /dev/null
+SCRIPT_ROOT=`pwd`
+popd > /dev/null
+
+cd "${TMP_DIR}"
+git clone https://github.com/kubernetes-incubator/client-python.git
+cd client-python
+cp -r "${SCRIPT_ROOT}/." kubernetes/base
+pip install -r requirements.txt
+pip install -r test-requirements.txt
+
+# Run the user-provided command.
+"${@}"
+

tox.ini

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+[tox]
+skipsdist = True
+envlist = py27, py34, py35, py36
+
+[testenv]
+passenv = TOXENV CI TRAVIS TRAVIS_*
+commands =
+   python -V
+   pip install nose
+   ./run_tox.sh nosetests []
+