Add style property to tooltip

Created by: FloNeu

I just had the issue that i wanted to use your tooltip plugin as std. tooltip and as diff. styled error tooltip on form validation. Therefore i added an additional 'style' option to the plugin. I am pretty new to jquery so i dare posting my code here, but it really only was an additional default param, and adding the style to the template. Maybe that would be a very usefull addition to the plugin.

Thx so much for this great toolbox! Florian