update test to python 3.3

The unicode literal was failing the tests on 3.2, and 3.3 has since
included the u'' syntax again.
Ref: http://www.python.org/dev/peps/pep-0414/
Merge pull request #12 from DataDog/update_to_python_33

update test to python 3.3
Merge branch 'master' into events