orientation -> symbolizer_base::value_type
use 2 spaces identation in xml output
prefer c++11 range based loops for readability
MinGW support for SConstruct script. Build now properly detects MinGW and finds dependencies correctly.
Properly Initialize mingwbuild variable.
Added singleton unit test to check for multiple instances across multiple dynamic libraries.
Updates for supporting 64bit MinGW build on Windows 7+ via GNU tools.
Final MinGW 64 bit enhancements for Windows 7+ and Server 2008+
Updates to resolve issues after rebase from origin master for MinGW. Added a few additional exprts and template library dependencies for GCC 4.8.1.
Reordered dependencies in correct link order and added graphite2
Environment clone required.

Environment clone failed to carry over in rebase. Added back in.