update dojo version in READMe doc
apply filter on children rows when Tree module is used
solve issue #217

add onShow and onHide event for HiddenColumns module
relayout should be implemented when grid is in a container like titlepane when clientHeight is 0
update test page
Revert "apply filter on children rows when Tree module is used"

This reverts commit f64c7de63f1875bc32273f567583b5ac2c53927d.
remove xhr dependency in core
Merge branch 'master' into 1.3