use nmake for harfbuzz since cmake can't create visual studio 2014
files. Previously this worked because I had visual studio 2012 on
my system but this fails on a system with only 2014.
newest png expects zlib 1.2.8 - lets hope the tiff error does not return
add harfbuzz to master build script
target mapnik 3.x now
Add more build deps
remove hardcoded zlib version
have zlib build script the copy some programs expect
boost python fixes
tiff with zlib-1.2.8 still broken, rollback to 1.2.5
Add chocolatey install
remove last zlib references with explicit version
fix cairo linking to libpng