BLD: tweaks to setup.py to include more metadata

Author: tacaswell

setup.py

@@ -7,6 +7,16 @@
       description='Composable style cycles',
       url='http://github.com/matplotlib/cycler',
       platforms='Cross platform (Linux, Mac OSX, Windows)',
-      requires=['six'],
-      license="BSD"
+      install_requires=['six'],
+      license="BSD",
+      classifiers=['Development Status :: 4 - Beta',
+                   'Programming Language :: Python :: 2',
+                   'Programming Language :: Python :: 2.6',
+                   'Programming Language :: Python :: 2.7',
+                   'Programming Language :: Python :: 3',
+                   'Programming Language :: Python :: 3.3',
+                   'Programming Language :: Python :: 3.4',
+                   'Programming Language :: Python :: 3.5',
+                   ],
+      keywords='cycle kwargs',
       )