package: python 3.4 support, remove unused os import

Author: tony

setup.py

@@ -6,7 +6,6 @@
 Manage tmux workspaces from JSON and YAML, pythonic API, shell completion.
 
 """
-import os
 import sys
 
 from setuptools import setup
@@ -56,6 +55,7 @@
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
         "Topic :: Utilities",
         "Topic :: System :: Shells",
     ],