Modified PullRefresh implementation for Touch 2.2

5/4/2013 Commit Change Log:
Change summary:  Modified PullRefresh implementation as Touch 2.2
removed support for refreshFn
- Added pull refresh to dow2012 example (maintabpanel.js) via
"listPlugins : {xclass: 'Ext.plugin.PullRefresh'}"
- Replaced refreshFn event handling in example2 (ProjectContainer.js)
with new Touch 2.2 event "latestfetched"
via listPlugin config.  Workaround to snap list back after manually
loading data for this example is
to modify loadExample2Store() function within TouchTreeGridController.js
to pass scrollToY = 1 to
loadStore() function to reset scroller after loading data.