v6.0.0

we now have native support for drag&drop on dekstop and mobile out of the box, no external lib needed and more reliable across browsers (mouse event and touch)

• converted previous HTML5 draggable=true based code to simple Mouse Events and Touch mobile support for drag&Drop.
• removed all jquery-ui related code, and D&D plugging as we only support native events now
• alwaysShowResizeHandle now support 'mobile' which is the default, making it much easier (see doc)
• changed commit() to be batchUpdate(false) to make it easier to turn batch on/off. updated doc. old API remains for now