Need a squirrel deployment story

[jaredpar]

As much as I like building from source I think it would be nice if there was an auto-updating deplyoment option. Squirrel seems to be the new hotness here.

[Pilchie]

Feel free - https://github.com/Pilchie/xunit.runner.wpf/blob/master/docs/making-a-release.md is the current process...