Fix dumpdb

Since the dumpdb command was broken, I decided to hook right into it
instead, where it actually hade a file parameter.

It's tested locally, and it actually outputted a zipfile this time! \o/

closes #215
Redirect article to correct language

Today, a user that goes to wikipendium.no/TEP4105 will be presented
with the missing language screen, as the compendium only exist in
norwegian.
This makes the use of short URLs to compendiums impractical.

With this pull request, if the requested language version doesn't exist,
the user will be redirected a version that does exist, if there is only
one language version of the article.

If there exist multiple, the user will still be presented
with the existing 'missing language' page.

Closes #220
Remove unused code
Merge pull request #224 from stianjensen/redirect-language

Redirect article to correct language
Merge pull request #225 from stianjensen/fix-dumpdb

Fix dumpdb
Update README.md (Setup on Windows)
Merge pull request #226 from iver56/update-readme

Update readme
Add amsmath support

This fixes #223.
Merge pull request #229 from stianjensen/amsmath

Add amsmath support
Add all page to frontpage

This commit moves the all page to the frontpage and integrates the all
list with the search on the frontpage.
Switch to django 1.6 compatible django-registration
Merge pull request #233 from stianjensen/django-registration-fix

Switch to django 1.6 compatible django-registration
Merge pull request #221 from stianjensen/new-frontpage

Add all page to frontpage
Add travis-ci integration
Add flake8 to requirements file
Fix lint error
Merge pull request #236 from stianjensen/add-travis

Add travis-ci integration
Update autocomplete to enchance mobile experience
Merge pull request #235 from stianjensen/mobile-enchacements

Update autocomplete to enchance mobile experience
Sort search results by relevance

Relevance is decided as a function of how early in the course title the
search term is, as well as how early in each of the words of the course
title the search term is.

This fixes #234.