Some minor changes for Python 3 compatibility
Test script moved to the root directory
Tests rewritten with pytest instead of nose (running in Python 2.x)
Merge branch 'python3' of https://github.com/ricardoduarte/Unipath into python3
Merge branch 'master' of https://github.com/ricardoduarte/Unipath into python3
Tox integration with pytest running in Python versions 2.6, 2.7, 3.2 and 3.3
Added requirements.txt
fix iteritems, does not exist in python 3
Included Python 3 information on setup file and README