Add trimmed term support

Nice module. When I tested it, the module performed as documented.

I immediately found another problem though, with blank padding. When I added two terms, 'term 1' and 'term 1 ', they were of course seen as different by taxonomy, and also by this module. They look like duplicates to a person but Drupal sees them as different.

Adding term (string) trimming to your module would nicely complement the existing functionality and would eliminate this problem.