update: Added achievement mining from wiki pages

* Added a script that tries to mine Wiki pages for achievements (events
  with time associated to them).

* Updated `getnames.py` to also dump the Wikipedia page ID of the wiki
  page which was used to produce the ontology.

* Added Artists dump.

Signed-off-by: mr.Shu <mr@shu.io>
Wouldn't it be better to have all the requirements in one place, in root folder?