Still pondering how to patch this
Moving the tests into their own directory.

--HG--
rename : premailer/test-apple-newsletter.html => premailer/tests/test-apple-newsletter.html
rename : premailer/test-external-links.css => premailer/tests/test-external-links.css
rename : premailer/test-external-styles.css => premailer/tests/test-external-styles.css
rename : premailer/test-issue78.html => premailer/tests/test-issue78.html
rename : premailer/test-unicode.html => premailer/tests/test-unicode.html
rename : premailer/test_premailer.py => premailer/tests/test_premailer.py
Adding Python 3.3 testing with Tox
Confirming that the 50 tests actually do run on CPython (Python 2.7, Python 3.3, and Python 3.4) and PyPy
Fixing the import of StringIO
Switching to BytesIO for binary data, and testing the premailer.premailer.Premailer._load_external_url method