Merge pull request #1005 from twokul/master

capitalize the letter
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