[mappy] Parallel feature requests supports - PostGIS async requests
+ minor tweaks
c++ style : std::map
+ fix err message typo
+ opps, 'auto' is c++11
fix sign compare warning
fix #2018
Merge branch 'master' of github.com:mapnik/mapnik into Mappy-master-async-postgis
Merge branch 'master' of github.com:mapnik/mapnik into Mappy-master-async-postgis
cleanup postgis async test
code cleanup, consistent debug output
integrate async test into main postgis tests
maintain default of max_size=10 and improve error output in the case max_size < max_async_connections
minor c++ style fixes
avoid unneccesary projection copy
remove dead code (colorize-alpha is now officially an image-filter)
Merge pull request #2010 from mapnik/Mappy-master-async-postgis

Mappy master async postgis