c++ style
Use vertex_converters in text placement
text_symbolizer - ```geometry-transform``` support
iwyu
no need to output bbox in pj transform error
remove silly string compare between features (attributes is more explicit)
remove unused <<operator
iwyu
remove unused <<operator
iwyu
fix visual tests
travis: try building with -flto
travis: also install libstdc++-dev
travis: debug failed configure
further attempt at lto with clang
travis: put custom installed clang-3.4 on path
travis: gold linker needs to be told to see in /usr/local/lib
travis: install harfbuzz in /usr/lib since gold linker ignores LD_LIBRARY_PATH
travis: disable RANLIB
agg: disable unused epsilon