Tweaks to setup.cfg

Add in 3.4 classifier (and adjust spacing of the
classifier section) since 3.4 support will be maintained
ongoing in the future.

Adjusts the keywords to be a smaller list of comma
separated values that summarize what taskflow is all
about.

Adds python2.6 as a minimum version so that it is well
understood (it was already implied) what the minimum
python version we currently support is.

Hopefully this adjustment fixes bug 1323731

Change-Id: Ia20120b3e4064fb315ddcf018588f3af4e503d1e

setup.cfg

@@ -6,26 +6,24 @@ description-file =
 author = Taskflow Developers
 author-email = taskflow-dev@lists.launchpad.net
 home-page = https://launchpad.net/taskflow
-keywords = reliable recoverable execution
-           tasks flows workflows jobs
-           persistence states
-           asynchronous parallel threads
-           dataflow openstack
+keywords = reliable,tasks,execution,parallel,dataflow,workflows,distributed
+requires-python = >=2.6
 classifier =
-    Development Status :: 4 - Beta
-    Environment :: OpenStack
-    Intended Audience :: Developers
-    Intended Audience :: Information Technology
-    License :: OSI Approved :: Apache Software License
-    Operating System :: POSIX :: Linux
-    Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.6
-    Programming Language :: Python :: 2.7
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.3
-    Topic :: Software Development :: Libraries
-    Topic :: System :: Distributed Computing
+        Development Status :: 4 - Beta
+        Environment :: OpenStack
+        Intended Audience :: Developers
+        Intended Audience :: Information Technology
+        License :: OSI Approved :: Apache Software License
+        Operating System :: POSIX :: Linux
+        Programming Language :: Python
+        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
+        Topic :: Software Development :: Libraries
+        Topic :: System :: Distributed Computing
 
 [global]
 setup-hooks =