Allow the project to compile using Visual Studio 2013
Update Windows build instructions
Add virtual destructor to get rid of Xcode warning.
Merge pull request #3043 from ey6es/master

Add virtual destructor to get rid of Xcode warning.
Merge pull request #3041 from kitely/vs2013

Allow the project to compile in Visual Studio 2013
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels