use hbsfy and ember-template-compiler to precompile handlebar templates

Using the hbsfy browserify transformation to precompile .hbs files.
Downside is we have to manually require each hbs file in main.js. We
will see if there are other options later. For now let's see whether
this speeds up load times.
switch to ember.prod.js when building for deployment

Ember prod gets rid of debug statements and assertion calls, so it
should run a little faster. Unfortunately, there isn't a way to specify
which ember version to build using browserify because of lack of
conditionals. The solution here is a bit hacky; we copy either the prod
or dev version to ember-browserify.js and have browserify serve that
file as the ember module.
remove source maps from production build

Aiming for faster builds. Don't really need source maps in a production
build. Bugs should be found in dev.
add example application for gh-pages. no auth required