initial commit of taxcalc package

- moved translation.py to taxcalc
- added trivial setup.py for installs
added __init__.py
adding Travis CI script

- tests python 2.7 and 3.4
fixes to .travis.yml
added a requirements.txt for pip
.travis.yml fixes
more .travis.yml fixes
add fake puf2.csv for now
Merge pull request #46 from talumbau/taxcalc_pkg

taxcalc as a package