Use Jekyll for gh-pages

I made you a jekyll site. GH will build the page so it's easier to develop.

I updated it with the latest docs from the readme (i.e. Ember CLI instructions). I wasted some time this morning bc they were out of date.

The readme should prob point users to the docs site so there's one source of info. The jsbin still needs to be updated.

You can see it here: http://www.samselikoff.com/ember-responsive/