Prepare for v2.3.2

create tag

First version of move up/down buttons for right side select options

Style a bit the code

Fix for issue crlcu#58 - Using optgroups breaks keepRenderingSort

Change the behaviour of hide/show functions only if browser is IE

Move all - bugfix for IE and Safari

Set as version 2.2.4

Make search case insensitive

submitAllRight bugfix (issue 40)