Small formatting fixes and optimizations
Make sure there are plugins registered for the type of the current node
Use REPLACE, apparently required for some reason (sounds like a hidden
bug)
Remove Internal Task Queue from Miner

This information is kept inside PyMW so there is no need to manage it
from the miner
Removing some Arguments from mine_internal

It is unclear whether the level can/will be implemented at this point
but it is very clear the other arguments are already contained in the
Relationship classes
Fixed node type name
Added Album Discovery

Now mining discography from the wikitext using the new wikitext plugin
module and the DiscographyPlugin class. These are now stored in their
respective tables at the miner.
Refactoring add_node method for a better structure
Fixing funny indentation