Update dependencies

[froi]

As a developer I want to update the current project dependencies.

[froi]

Ok part of what I want to do is have this project work well with Python 3, you know cause the future.

I've run caniusepython3 against the requirements as they stand now and we have the following packages that are blocking the transition:

• bitly-api
• django-ical
• django-markdown-deux
• django-pylibmc-sasl
• django-states

Next steps:

• [ ] Find alternative package or package version for bitly-api
  • Isn't used anywhere in the code. Eliminated.
• [ ] Find alternative package or package version for django-ical
• [ ] Find alternative package or package version for django-markdown-deux
• [ ] Find alternative package or package version for django-pylibmc-sasl
• [ ] Find alternative package or package version for django-states

[froi]

Resolved with PR #79