Updating setup.py to showcase current status and version support.

Also adding a shield to README that has all of our supported
versions and removing the text with the same content.

README.rst

@@ -5,7 +5,7 @@ Google Cloud Python Client
 
 .. _Google Cloud Platform: https://cloud.google.com/
 
-|pypi| |build| |coverage|
+|pypi| |build| |coverage| |versions|
 
 -  `Homepage`_
 -  `API Documentation`_
@@ -39,22 +39,6 @@ Quick Start
 
     $ pip install --upgrade gcloud
 
-We support:
-
--  `Python 2.6`_
--  `Python 2.7`_
--  `Python 3.4`_
--  `Python 3.5`_
-
-For more information, see `Supported Python Versions`_ in
-``CONTRIBUTING``.
-
-.. _Python 2.6: https://docs.python.org/2.6/
-.. _Python 2.7: https://docs.python.org/2.7/
-.. _Python 3.4: https://docs.python.org/3.4/
-.. _Python 3.5: https://docs.python.org/3.5/
-.. _Supported Python Versions: https://github.com/GoogleCloudPlatform/gcloud-python/blob/master/CONTRIBUTING.rst#supported-python-versions
-
 Example Applications
 --------------------
 
@@ -232,3 +216,5 @@ Apache 2.0 - See `LICENSE`_ for more information.
    :target: https://coveralls.io/r/GoogleCloudPlatform/gcloud-python?branch=master
 .. |pypi| image:: https://img.shields.io/pypi/v/gcloud.svg
    :target: https://pypi.python.org/pypi/gcloud
+.. |versions| image:: https://img.shields.io/pypi/pyversions/gcloud.svg
+   :target: https://pypi.python.org/pypi/gcloud

setup.py

@@ -36,7 +36,7 @@
     zip_safe=False,
     install_requires=REQUIREMENTS,
     classifiers=[
-        'Development Status :: 1 - Planning',
+        'Development Status :: 4 - Beta',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Operating System :: OS Independent',
@@ -45,6 +45,7 @@
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
         'Topic :: Internet',
     ]
 )