Merge pull request #25 from besoft/OpenMAF-2-2

Added support for Visual Studio 2013 compilation
Merge https://github.com/b3c/MAF2 into OpenMAF-2-2
Merge pull request #26 from besoft/OpenMAF-2-2

FIXED BUG: If the passed data is not of vtkPolyData, polydata will be NU...
Merge https://github.com/b3c/MAF2 into OpenMAF-2-2