detail changes for WinRT support
Removing MSOT copyright, replacing with Microsoft.
Updating macro for detecting WinRT to BOOST_WINDOWS_RUNTIME based on code review feedback.
Updating macro for detecting the Windows Runtime based on accepted changes adding a Boost.Predef.
Remove headers moved into core.
Merge pull request #4 from MSOpenTech/winrt

[winrt support] Changes to update some of the Windows APIs to help support the Windows Runtime
The file has been moved to Boost.Core.
Removed executable attribute.
Remove indirect_reference.hpp, it has been moved to iterator.
Remove detail/endian.hpp, moved to predef.
The files were moved to Boost.WinAPI submodule.