Automatically checkout files from TFS for server workspace

[tadyshev]

This extension works well with local TFS workspace but not with server workspace. There was a feature request/issue for the Paket project. That issue was resolved by having FAKE checkout files before paket.exe modified them.

Could we add ability to optionally execute FAKE scripts? It makes sense that we want to avoid coding against TFS with Paket project but would that still be the case as this extension is Visual Studio specific?