Added py3 tests to tox.ini
Python 3: Added class _fileobject()
Python 3: Fix StringIO usage
Test stuff (WIP)
Merge branch 'add-python3.3-support' of https://github.com/vikt0rs/eventlet into add-python3.3-support

Conflicts:
	tests/patcher_test.py
	tox.ini
Fixes due to tests from zmq_test.py passed on py3