MSBuild bug when path contains blanks

some windows paths include blanks, therefore there is a need for double quotes to work without error
example: C:\User\Visual Studio Workspace\bower-nuget\ should be "C:\User\Visual Studio Workspace\bower-nuget\" to work in terminal without errors

![bower-nuget](https://f.cloud.github.com/assets/6577779/2148964/9b2a128a-93ed-11e3-917b-a3dab273b275.PNG)
This error occours while building our project. (Notice blanks in path "Visual Studio Workspace").