Wpm module refactor

The wpm module has been refactored to remove the dependency on the wiki-miner web service. Instead the information is directly loaded and calculated from the csv files.

Changes:
- remove dependency on wiki-miner web service, retrieve the data directly from memory or redis
- update csv load script to include missing data
- some general improvements in names and class structures of wpm module
- added db versioning, as such that one could import a new dataset while the service is running.
- updated config files to support code changes

Notes:
- needs some more testing with in memory module.