Set up mock responses for lazy loading tests
Can load data asynchronously
Add example
Add getItemsFromServer and getItemUrl
Clicking expand button fetches data
If in async mode, collapse folders by default
Test and refactor: implement addItemsFromServer
getItemUrl and getItemsFromServer take an item instead of UID
Can customize how item urls are built with the itemUrl options
Rename ajaxRoot -> ajaxSource
Don't lazy-load by default
Update README with AJAX instructions
Build
Merge pull request #40 from sloria/lazy-loading

Load data with AJAX + lazy loading