Update to work with MW1.21.x & 1.22alpha

Mainly a compatibility release. Bump to version 0.2.
Some other changes:
* $wgAutoCreateCategoryStub allows to override the stub text
* Now uses proper MW wrapper functions to create SQL query
* The page's categories list comes from the parser output

Change-Id: Ib3f274cd8b57f186ed155047cb93ddb471109dca