fix for issue WindowsAzure/hydra#233
Merge branch 'dev' of github.com:WindowsAzure/azure-sdk-for-net into bug233
Merge pull request #319 from markcowl/bug233

fix for issue WindowsAzure/hydra#233
Merge branch 'dev' of https://github.com/WindowsAzure/azure-sdk-for-net into etw
Cleanup
Moved common tracing functionality into CloudTracingExtensions and added tests