Port Sinatra app to go

I needed a test app to try and mix @toolmantim's Makefile replacement of grunt with go compilation and thought - hey, I'll just port my personal site to go.

So now, when doing local dev ```make watch``` will both recompile the sass and recompile the go (so you've got live code reloading for everything) - and while it's compiled it's still faster than running grunt and rerun with ruby.