[FIX] website: snippet resizing; Users don't understand when they can drag arrows...

[FIX] website: snippet resizing; Users don't understand when they can drag arrows to resize col-md-XX. They try, it does not work, so they think the feature does not work. So, horizontal arrow on col-md-XX snippets should use an icon according to what you can do

bzr revid: chm@openerp.com-20140217100418-iwdrv36a4u2inasn