fix documentation bug - closes #311
remove accidental bias value
[build] configure and pass full path of node to xcode - fixes #211 and #311
[build] make sure python 2.x build dependency is clear
list supported compilers
fix #313
add comment for magic value
adapt to mapnik/mapnik-packaging#157
fix linux build
separate bucket render properties and change naming
Add curl to Ubuntu apt-get install instructions

`make setup` barfed when it couldn't find curl in the path, so we need to add it to the pre-build installs on Ubuntu.
move to std::map for classes
make code more concise
template the parser
convert to json
move to namespace to fix compile error on linux/gcc
Fix dependency compilation for linaro-softfp
only ignore diagnostics with clang
load glDiscardFramebufferEXT with a library function if needed
make sure to use OpenGL ES 2.0 when compiling for nvidia chips