Fixed REAME file name change in setup.py

so pip install tar.gz would work.
Merge pull request #25 from xiaket/master

Fixed REAME file name change in setup.py
Autodetection is unix only, not linux only

runs on Macs
Merge pull request #29 from jomo/master

Autodetection is unix only, not linux only
python3 support

execfile has been [removed in Python 3](https://docs.python.org/3.3/whatsnew/3.0.html?highlight=execfile#builtins)
Merge pull request #30 from jomo/patch-1

python3 support in setup.py: execfile
Merge changes from origin