Simplelayout-ui-dragndrop

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- fix Drag'n'Drop feature, if mouse moves too fast ;-) [mathias.leimgruber]
- fix Drag'n'Drop feature for Safari [jonas.baumann]
- enable caching for js [mathias.leimgruber]
- remove jq ui version from file name [mathias.leimgruber]
- updated to jquery ui 1.7.2 [mathias.leimgruber]
- fixed dragndrop if there is more than one simplelayout-container
(for dropzoneportlet) [mathias.leimgruber]

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- make dragging and dropping with multible columns/slots available
[mathias.leimgruber]

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- Initial release [mathias.leimgruber]
- implements block drag 'n' drop [mathias.leimgruber]
- useing jquery [mathias.leimgruber]