not all templates are pre-compiled in minified build

[stefanpenner]

steps to reproduce:

1. grunt
2. search dist/ember-widgets.min.js for Ember.Handlebars.compile(

expectation:

in the minified build all templates to be precompiled, so that only the handlebars runtime is required for production builds.

• prefer templates over templateNames not all templates are pre-compiled in minified build #23
• precompile defaultTemplate

[stefanpenner]

for pre compilation of templates, ember itself does the following:

https://github.com/emberjs/ember.js/blob/2556dcf5e764c4c3c98a1f8eaa19e60766473697/packages_es6/ember-handlebars/lib/controls/select.js#L339

and then at build time, we do the precompilation + inline the template.

[blimmer]

I'd love to see this working. Now that ember-i18n doesn't require the full version of handlebars (as of 2.1.0), I would like to switch over to the runtime. Alternatively, if #68 were fixed, this would also resolve my problem as I'm not using AccordianWidget.