tolerance option accepts negative values Items with child containers no longer use sameResultBox
tolerance option accepts negative values
Items with child containers no longer use sameResultBox

closes #22

bygiro/jquery-sortable,anwarshaikh47/anwar1,farindra/jquery-sortable,bygiro/jquery-sortable,bygiro/jquery-sortable,Youraiseme/jquery-sortable,farindra/jquery-sortable,leafiy/jquery-sortable,leafiy/jquery-sortable,leafiy/jquery-sortable,migueldanto/jquery-sortable,farindra/jquery-sortable,migueldanto/jquery-sortable,anwarshaikh47/anwar1,farindra/jquery-sortable,leafiy/jquery-sortable,migueldanto/jquery-sortable,anwarshaikh47/anwar1,lok0613/jquery-sortable,lok0613/jquery-sortable,Youraiseme/jquery-sortable,Youraiseme/jquery-sortable,migueldanto/jquery-sortable,bygiro/jquery-sortable,Youraiseme/jquery-sortable,lok0613/jquery-sortable,lok0613/jquery-sortable