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Add missing onDragleave callback and add canUpload callback
Add canUpload and uploadDenied options
Add tests for upload permissions
Make sure grid is bound to ajax callbacks
Add addData method
Add jquery initialization
Add getRefreshHints method
getDataFrom server gets passed a `done` callback
Fix Tree::collapseAt and add HGrid::collapseAll
Working lazy-loading

plus updated examples
Fix getting item in expandItem
_loaded is set by _lazyLoad method

Update README
Merge branch 'lazy-loading' into develop
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