Addition of BOOST_PLAT_* platform definitions for MinGW and Windows
Detection of ARM architecture for Windows compilers to target mobile devices
of WIndows 8.
Improved ARM detection for 64 bit ARM.
Added detection of iOS an an operating system.
Improved detection of endianess on some platforms.
Addition of exclusive plus emulated definitions for platform and compiler
The big change for this version is the restructuring of the definitions to
avoid duplicate definitions in one category. That is, only one BOOST_OS_*,
variant will be detected (except for sub-categories).