python render_with_detector: respect scale_factor and offsets - refs #2075
fix hit_test for lines + add tests - refs #2041
iwyu
add tests for geojson empty/null geoms - #2083
apply 5eb406c7df to non PHOENIX_V3 code
Merge branch '2.3.x' of github.com:mapnik/mapnik
merge with branch 2.3.x
remove unused code
text rendering benchmark
travis: build verbose
travis: pull gdal
Improved support for international text

 - Implementation by @herm for GSOC 2012 (http://mapnik.org/news/2012/10/06/gsoc2012-status9/)
 - C++11 port, improvements, optimizations by @artemp
 - Testing and integration with master by @springmeyer
 - Thank you to all the support from @behdad along the way
 - Thanks for help testing @toton6868, @stephankn, @nirvn, @mfrasca, @simonsonc and many others

Refs: #2073,#2070,#2038,#2037,#1953,#1820,#1819,#1714,#1634,#1547,#1532,#1319,#1208,#1154,#1146
Merge pull request #2087 from mapnik/harfbuzz-merge

Improved support for international text
update expected test images post #2087
update expected test grids post #2087
travis: build harfbuzz on the fly