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