Adding an extra option for ServiceMatrix for Visual Studio 2013

- Added an extra option to install VS 2013 for ServiceMatrix.
- Works as before (i.e. if the SM is already installed via Platform Installer, will display Installed.
- This does not address the Update scenario, i..e what if user has SM 2.0.1 installed and we now have 2.1.0. 

When SM is not installed:
![image](https://cloud.githubusercontent.com/assets/854553/3036500/a5826ffa-e0ac-11e3-8543-bc88d5ea861e.png)

@SimonCropp @andreasohlund @gbiellem - please review