add trove classifiers for Python 3 and 3.4

Author: Technologicat

setup.py

@@ -175,6 +175,8 @@ def ext_math(extName):
                     "Programming Language :: Python",
                     "Programming Language :: Python :: 2",
                     "Programming Language :: Python :: 2.7",
+                    "Programming Language :: Python :: 3",
+                    "Programming Language :: Python :: 3.4",
                     "Topic :: Scientific/Engineering",
                     "Topic :: Scientific/Engineering :: Mathematics",
                     "Topic :: Software Development :: Libraries",