updated check boxes to follow patternfly theme

added hover style for select item widgets
updated check icons
n.b. can't quite follow patternfly theme entirely - the hover check icons aren't white. I couldn't get a hover image working on the select list.  Looking at the available .gifs this *should* be possible.  I just couldn't figure it out.

Also left the 'unchecked' image as an empty box.  I couldn't figure out how to select the list item unless the 'click' occurs on the image.  Selecting the text doesn't appear to select the row.  I assume this is by smartgwt design and couldn't find an option to change the selection behavior