add handlebars, uncompressed ember, css

* handlebars 1.0.0-rc.3 is required by ember;
* uncompressed ember makes debugging easier
* css fixes missing left indent in boostrap
* also clean up indents in sinatra+bootstrap template
* move JS to just before closing body tag
add ember data (edge shit)
rm dumb 'secret' thing from boilerplate
work through "codecamp" sample app, modulo backend