Include keyboard.js by default

props to Ben Weaver (@weaver) for making a pretty cool API for this
Make better keyboard shortcuts

currently can toggle autorefresh with Ctrl + R
toggle show /  hide builds with Ctrl + B

planned : go forward and backwards in time to see the various builds
bound functions for navigating builds

might even make it possible to jump directly to a given build, but this is
nice enough already for 90% of what I use goldberg for