+ make operator=() non-throw
+ use std::swap()
+ better error reporting
iwyu
fix access to mapnik::query::property_names in python - closes #1762
remove not yet implemented flag
reduce overhead of flexible agg gamma setting per symbolizer - closes #1174
add new gamma members to agg_renderer
avoid potential zero division resulting in nan in agg::gamma_linear - closes #761
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Fix postgresql connection leaks

Return connection to pool on connection error (see #1708)
Fix leaks on persist_connection=false (#1711)

Includes testcase for #1711
+ disable failing clipping tests pending different impl
mapnik-utils: make fonts/inputplugins actually relative and dynamically constructed if they can be
Merge branch 'master' of github.com:mapnik/mapnik
fix a variety of msvc compiler warnings about signed/unsigned implicit conversion
c++ style
cairo halo patch via @springmeyer ( #1624 )
avoid gcc unsigned/signed comparison warning
mapnik-config also add cxxflags to cflags for full backwards compatibility with previous behavior