Update HOUSE2012_POLY to current shapefile

Here are the changes:
District Number: Previous Representative -> Current Representative
16: David B. Sullivan (D) -> OPEN
87: OPEN -> Wayne A. Matewsky (D)
131: Martha M. Walz (D) -> OPEN
36: OPEN -> Leah V. Cole (R)
135: Linda Dorcena Forry (D) -> OPEN
158: John P. Fresolo (D) -> OPEN
Merge pull request #3 from jwass/updated_house_polygons

Update HOUSE2012_POLY to current shapefile