updated readme
fixing offset, added scrolling
replaced parent option with appendTarget
fixed mouse down handler

now it will switch cols when the drag display is 1/2 over the next /
prev col
formatting, remove unused argument
new var for elem position
var reorder, looks cleaner
clean up of scroll option
code clean up
removed deprecated method
combined 2 methods, one was only calling the other
clean up of tests
updated demo