travis: abandon clang++ builds since travis appears unable to use upgraded clang (unlike stock precise)
add has_svg_renderer status to python bindings
Actually convert the python tests - finishes #1460
tests: prefer testing png encoded bytes
c++11 : use nullptr instead of NULL
fix wkt_multi_generator typedef - previously accidentally matched mapnik::geometry_container - bug spotted by @mojodna - refs #2098
tests: re-enable strict map loading tests
fix #2090
visual tests: re-enable and update malayalam, bengali, and khmer renderings
visual tests: fix rendering of khmer, malayalam, and bengali tests
add testcase for #2090
travis: reduce email noise post policy change: http://about.travis-ci.org/blog/2013-11-19-upcoming-email-notification-policy-change/
avoid duplicate call to start_layer_processing

Conflicts:
	include/mapnik/feature_style_processor_impl.hpp
avoid dereferencing pointer more than once