todo-list directive using AngularFire service
Merge branch 'master' of https://github.com/amitkumar/angularjs-tutorial

* 'master' of https://github.com/amitkumar/angularjs-tutorial:
  demonstrating transclude
  communicating to an outside controller through scope functions, correcting directive controller name
  demonstrating controllerAs syntax within a custom directive
  moving todo list to its own directive

Conflicts:
	src/app/main/main.controller.js
	src/app/main/main.html
	src/components/todo-list/todo-list.directive.js
	src/components/todo-list/todo-list.html
	src/index.html