Merge pull request #453 from WindowsAzure/master

Bringing dev into sync with master
Removes unncessary readme.txt files from the project
Merge pull request #455 from jeffwilcox/dev-readme

Removes unncessary readme.txt files from the project
Added null check to UrlHelper.Concatenate
Merge pull request #456 from stankovski/url-concatenate

Added null check to UrlHelper.Concatenate
revved compute SDK project reference to new version of MyGet deps
regenerated project after updating spec reference
fix for suggestion in PR
Merge pull request #457 from bradygaster/dev

revised compute SDK project reference to new version of MyGet dependencies
increased version # to enable nuget publication
Merge pull request #460 from bradygaster/dev

increased version # to enable nuget publication
Merge pull request #461 from WindowsAzure/dev

Merge from dev to master