backport geojson parsing/generation fixes from master to 2.3.x - refs #2083
add has_svg_renderer status to python bindings
fix wkt_multi_generator typedef - previously accidentally matched mapnik::geometry_container - bug spotted by @mojodna - refs #2098
fix #2090
travis: target latest postgres
avoid duplicate call to start_layer_processing
MinGW support for SConstruct script. Build now properly detects MinGW and finds dependencies correctly.
Properly Initialize mingwbuild variable.
Added singleton unit test to check for multiple instances across multiple dynamic libraries.
Updates for supporting 64bit MinGW build on Windows 7+ via GNU tools.
Final MinGW 64 bit enhancements for Windows 7+ and Server 2008+
Final MinGW 64 bit enhancements for Windows 7+ and Server 2008+