Add Python 3 support

Change-Id: I65fabfc4788230b7280808ec912601c327095db0

Author: CyrilRoelandteNovance

setup.cfg

@@ -16,6 +16,8 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 2.6
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.3
 
 [files]
 packages =

tox.ini

@@ -7,6 +7,7 @@ skipdist = True
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
+         PYTHONHASHSEED=0
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'