Added Left/Right option and IE8 Adjutments

Hi rumspeed,

I've been using your plugin here on several sites and really liked it's ease of use. Very nice clean code as well.  

Several projects I was working on needed the option of right/left display and there were some fixes to IE8 display that needed to happen. So I've adde those here.

The only thing I'm not happy with at the moment is the right align display fixed needs to have some CSS reworked to display more consistently on the right side. For now the right: -156px; is working, but when I get a chance I'll look into making it so it works with just having right: 0. 

I added my WordPress username to the readme in case you wanted it.
Nice work.

Isaiah