QGIS 2.14.8 & 2.18, GDAL & GEOS Updates

QGIS 2.14.8 and 2.18 are now available. GDAL updated to 2.1.2 and GEOS updated to 3.5.1. I also restored the speedups to the GEOS Shapely python module (it’s been missing because I was missing some Python development modules).