Add an handleKeyPressEvent function.
    Press on the return key allow the user to :
    * directly submit the edit panel
    * create a browser node of the actual selected one.
under cinstruction shortcut
under construction
not working at all
Add event shortCut into a jsmind.edit.shortcut scipt
Merge pull request #2 from mbriot/returnKeyEvent

Add an handleKeyPressEvent function.