Some keyboard usability improvements

* Escape-hatch in input event handling for ' and /, the firefox find as you type shortcuts
* Bind 'escape' to searchbox focus, vim-style

As mentioned in https://github.com/jafingerhut/jafingerhut.github.com/issues/2 - not sure if the escape-focus thing is really desired, but I've seen it in a few other UIs and figured i'd add it in while i was there.