Add a recipe for using modal dialogs
Add Using Modal Dialogs to guides.yml
Merge pull request #1007 from mitchlloyd/master

[cookbook] Add a recipe for using modal dialogs
Add shell syntax highlighting to README
Merge pull request #1009 from ryanponce/patch-2

Add shell syntax highlighting to README
example's markup should not be wrapped in handlebar's script tag since ember.js is not included yet at this step.
Merge pull request #1012 from ssaki/master

example's markup should not be wrapped in handlebar's script tag
Update displaying-model-data.md

Ember.Route.extend() creates something like a class not an object, doesn't it?
Update displaying-model-data.md
Merge pull request #1013 from mostwanted1976/patch-1

Update displaying-model-data.md
Change orange button to use CSS instead of an image
Add helper for determining device pixel ratio
Add HiDPI mixin for handling higher dpi images
Add HiDPI code background
Add HiDPI Ember logo

Also removed drop-shadow filter as it was buggy with the HiDPI
version of the logo and made the logo it self have the drop shadow.
Add HiDPI chapter mark
Add HiDPI footer links
Add HiDPI ajax loader
Add Font Awesome via Fontello

Included config.json for adding more icons
Use Font Awesome for footer links instead of images