save original float value to use in setFixed()

target.css('float') always returns "none" when position is absolute or fixed. http://jsfiddle.net/UziTech/5an00wzs/1/

This caused a problem when the target used float and had a limit set. Once the target reached the limit the position would be set to absolute. When the element changed back to fixed the float value for the spacer would be set to none instead of the target's float value.

I fixed this by saving the original float value as originalFloat and using that in setFixed()