VS2013 Support

This is relatively stable but no to be considered complete. Currently supported:
1. Installing user/dev kit (as normal)
2. Creating C#/VB/F# projects (latter 2 untested)
3. Debugging a Cosmos project - see limitations list below.

Debugging limitations:
1. Breakpoints sometimes fail to be hit. Only known thing that may help is recompile everything.
2. Specific breakpoint failure case: If you try and place a breakpoint on or after a "while(true)" statement it is extremely unreliable.

Other limitations:
1. VMWare occasionally breaks. If you get "Internal error" messages, or if VS crashes (don't let Windows "fix" it) or if VMWare fails to load properly there is only one known & reliable solution: Re-run the VMWare installer and hit "Repair". No restart required. You won't lose your VMs or settings (AFAI can tell).

If it all breaks, feel free to rant at it ;)
Merge TFS Changeset 105304