Tell Google Analytics user is still on page

This commit tells google analytics every five minutes that a person
still is on the page. This will help us have better numbers from GA.
Merge pull request #217 from stianjensen/update-ga

Tell Google Analytics user is still on page
Switch to dumpdb
Improve error message when validating article slug

This fixes #204.
Add period in error message for consistency
Merge pull request #216 from stianjensen/dumpdb

Switch to dumpdb
Merge pull request #219 from stianjensen/better-error-messages

Better error messages
Delete unused languages

There were too many languages that were never going to be used. This
commit trims off a lot of them.
Merge pull request #222 from stianjensen/trim-languages

Delete unused languages
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