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/
store meta by const ref
use constexpr to allow combining type traits
symbolizer property value to string
python bindings : output property value
enumeration_wrapper to python converter (work-in-progress)
add quoting for relevant types
use mapnik::value_xxx types
avoid duplicate call to start_layer_processing

Conflicts:
	include/mapnik/feature_style_processor_impl.hpp
NumericWrapper helper class to pass correct numeric type
value_bool, value_integer, value_double to symbolizer property
(there must be a better way ;)
add extract method to access underlying type from mapnik.Symbolizer
Merge branch 'master' of github.com:mapnik/mapnik into expr-v2

Conflicts:
	src/load_map.cpp
add __hash__ to all symbolizers
add equality comparator ``` .def(self == self) // __eq__```