[release] Prepare for tagging v4.0b3

Attempt at creating a better tagging and release process.

setup.py

@@ -2,7 +2,7 @@
 from setuptools import setup, find_packages
 
 setup(name="pymdptoolbox",
-      version="0",
+      version="4.0-b3",
       author="Steven A. W. Cordwell",
       author_email="steven.cordwell@uqconnect.edu.au",
       url="https://github.com/sawcordwell/pymdptoolbox",
@@ -14,7 +14,7 @@ setup(name="pymdptoolbox",
       "along with several variations.",
       download_url="https://pypi.python.org/pypi/pymdptoolbox",
       classifiers=[
-          "Development Status :: 2 - Pre-Alpha",
+          "Development Status :: 4 - Beta",
           "Environment :: Console",
           "Intended Audience :: Education",
           "Intended Audience :: Science/Research",
@@ -25,6 +25,7 @@ setup(name="pymdptoolbox",
           "Programming Language :: Python :: 2",
           "Programming Language :: Python :: 2.7",
           "Programming Language :: Python :: 3",
+          "Programming Language :: Python :: 3.2",
           "Programming Language :: Python :: 3.3",
           "Programming Language :: Python :: 3.4",
           "Topic :: Scientific/Engineering",