Clarify collection request/sync event behavior
Merge pull request #2127 from philfreo/master

Clarify collection request/sync event behavior
Fixed minor bug in examples/todos/todos.js

AppView.addOne was being called with incorrect context from addAll.
The method still worked, since window.$("#todo-list") returns the correct element, 
but it may be confusing for people learning backbone.js.
Merge pull request #2128 from colevscode/master

Fixed a minor bug in examples/todos/todos.js