I have seen this problem on several questions, all of the solutions work fine when you're building locally. I currently have my code on visualstudio.com, and I have an automatic build whenever I push code from my machine.
I know you have to install a nuget package (Which I have) and install the types from the following link:
http://go.microsoft.com/fwlink/?LinkID=239644&clcid=0x409
The problem is, I don't know how to install that from my browser, since it's building in the cloud.
Am I missing something?