Merge pull request #25 from dsandin/feature/WinRT

Move static initialization of  InitRunLoopTLSKey as it fails on the stor...
Merge branch 'feature/WinRT' of https://github.com/readium/readium-sdk into feature/WinRT
Merge pull request #26 from dsandin/feature/WinRT

Fix ZIP_EXTERN preprocessor definition
Merge branch 'feature/WinRT' of https://github.com/readium/readium-sdk into feature/WinRT