add support for halo-rasterizer for shields - closes #2226
use ppa:boost-latest
alt boost install method
stop testing bogus wkb since it will crash wkb reader - refs #2236
don't allow marker-spacing less than 1 - fixes #2218
optimize raster rendering when not resizing
travis: apt-get verbose to see problems
relax FeatureCollection grammar to allow arbitary key:value's
tests for #2245
remove unused variables
fix variable shadowing
minor benchmark build tweaks to be consistent with master
backport benchmark framework from master
benchmark: use halo-rasterizer='fast' (doubles perf)
rapidxml: validate closing tags like libxml2 parser (no overhead measurable seen)
pass string by const&
add localize script
travis: try removing postgres-server-dev
try to get gdal/ogr plugins building
expose various image symbols for windows - refs mapnik/node-mapnik#260