refs #79: Updated travis to test on 3.3
refs #79: Fixed print statements.
refs #79: All but images working.
refs #79: Fixed some broken tests for python 2.
refs #79: Got python3 passing, still a few small problems with python2
refs #79: Experimental support for python 3.4
Revert "refs #79: Experimental support for python 3.4"

This reverts commit 9b49d0058d8ad01bb86f36b29e7642fde92ddec9.
Refs #80. Added tox configuration
Refs #80. Configured travis to use tox
Refs #80. Added a section on known deviations from the ECMA 376 specification
refs #79: Got the last of the tests passing in both python2 and python3
Refs #80. Added a Running tests section
Refs #80. Documented currently supported python versions
Refs #80. Documented getting involved
Refs #80. Documented Release process
refs #79: Updated a test.
refs #79: Removed legacy test code.
Refs #80. Added section on setting up tox
Refs #80. Added a link to the tox documentation
refs #79: Docstring.