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.
Merge pull request #4 from MSOpenTech/winrt

[winrt support] Changes to update some of the Windows APIs to help support the Windows Runtime