Ensured that all the styles start with .pv- in order to separate from other styles

 - added a style to the tooltips
 - wrapped the jQuery UI styles to avoid conlicts
 - applied a 'reset' style to common elements to avoid conflicts
Moved the jQueryUI style *before* the pivotviewer styles as they need to be overridden:

 - centered the sliders in their containers
 - made the zoom slider fill the zoom control