#64 Switched to py3-compatible packages where possible

Not py3 yet:
* django-model-utils
* django-admin-sso
* s3 stuff
#64 All dependencies now py3 (at least what's left)

* django-admin-sso removed temporarilty
* django-model-utils ported (well, slightly buggy with 1.5 yet)
#64 django-nose is back in action (py3-compatible)
#64 py3 docutils
#64 Multiple py3 fixes in moscowdjango code
#64 py3.3 in travis.yml
#64 python 3.3.0  on heroku
#64 heroku doesn't support mercurial and python 3
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#64 Procfile
#64 Procfile fixed port
#64 Python 3 show-off
#64 Django-storages with old-school s3 backend ported to py3
#64 DEFAULT_FILE_STORAGE and STATICFILES_STORAGE temporary removed
#64 DEFAULT_FILE_STORAGE and STATICFILES_STORAGE with default kwargs
#64 Fixed dependency in requirements.txt
#64 Wrong import path fixed in django-storages fork
#64 subdomain calling format for s3
empty commit
#64 Custom storage backend back in action