Show good message if async is not supported

cf. #632
Merge pull request #691 from maartenba/master

Initial implementation of Glimpse.WindowsAzure and Glimpse.WindowsAzure.Storage
Merge pull request #688 from dahlbyk/anti-serialization

Show good message if async is not supported
Updated package dependencies for Glimpse.WindowsAzure
Merge remote-tracking branch 'upstream/master'