Merge pull request #21 from AbsoluteMSTR/master

Resolve bug with 3.x
python 2.6 support added w/ unit tests
Merge pull request #22 from vltr/master

Python 2.6 support
fix issues introduced by https://github.com/crsmithdev/arrow/pull/22 because of http://www.python.org/dev/peps/pep-3113/