Remove Mt Oliver Borough, which is a separate municipality

Test Approach
-----
Tested with complete difficult game playthrough.

Notes
-----
My friends were yelling at me about this. It was included in the shapefiles, but is actually a separate township.

Sources
------
http://en.wikipedia.org/wiki/Mount_Oliver,_Pennsylvania
"Mount Oliver is a borough in Allegheny County, Pennsylvania, United States. It is a largely residential area situated atop a crest about 3 miles (5 km) west of the Monongahela River. The borough is surrounded entirely by the city of Pittsburgh."

http://en.wikipedia.org/wiki/List_of_Pittsburgh_neighborhoods