Upgrade to Django 1.8

[HenrikOssipoff]

Django 1.8 is well underway in development, and is currently in the beta stage. It's expected to land in May.

Django 1.8 will mark another LTS for Django, and land a lot of new features, including Postgres specific features and a complete rewrite of the Template system (it will now be possible to choose your own template engine, since the Template system has been rewritten into a generalized API).

There are also a number of other changes going on, some of which can be easily implemented already in Django 1.7 projects (for example, new syntax for urls.py for the future).

Read more about the changes here: https://docs.djangoproject.com/en/dev/releases/1.8/

[HenrikOssipoff]

This likely wont make it into 4.0 of the Stregsystem, and we should likely wait until 1.8.1 anyway, before upgrading. However, besides from some changes here and there, there shouldn't be many changes needed for a smooth upgrade (we're already fiddling with some upgrades internally).