enable tiff with zlib
gdal build fixes
fix runtime problems with tiff - refs mapboz/mason#7
fix libxml2 compile with msvc 2014
make visual studio version configurable
fix libtiff build with msvc 2014
settings.bat: added PlatformToolset Parameter for Nov 2013 CTP
could failed patches trying to get 2014 compile working
Merge branch 'windows' of https://github.com/BergWerkGIS/mapnik-dependencies into windows
settings.bat: add CTP paths to %LIB%, %INCLUDE%
actually apply patch for gdal
better error handling
improve settings
Merge branch 'windows' of https://github.com/BergWerkGIS/mapnik-dependencies into windows

Conflicts:
	settings.bat
attempt to fix gdal build if done after cairo - refs #66
build webp from source as /MD DLL
build zlib and libpng /MD
build jpeg /MD
be explicit about building libxml2 with /MD
sqlite /MD