NG: Add data on state and territory governors from Wikipedia
NG: the 'Place Type' column isn't necessary in the governors data
NG: the Place name of Abuja FCT is just 'Federal Capital Territory'
NG: Include the full name of Bala Mohammed
NG: Correct party and election dates for Nigerian state governors

The Wikpedia list page has inconsistencies with the pages for each
governor; this commit applies corrections from those pages.
NG: Change party names to match those in ShineYourEye
NG: add a script to import the state governors of Nigeria
Merge branch 'nigeria-governors'