Tagging the 1.8.1 release.

set trunk version to 1.8

set trunk version to 1.8rc3

set trunk version to 1.8rc2

set trunk version to 1.8rc1

set trunk version to 1.8b1

set trunk version to 1.8a2

set trunk version to 1.8a1

set version to 1.7

updated version.txt http://blog.jquery.com/2009/02/12/jquery-ui-17-is…

…-the-new-16/