Bugfix. The remove icon wasn't being shown for contacts.
Some optimization changes.

Don't sort roster contacts needlessly.
Don't call show() or hide() needlessly.
No need for setting a 'sorted' attr on the last item.
Bugfix.

With auto_subscribe=True, "Pending Contacts" header didn't disappear
after user was added to the roster.
New minified files. Bump version to 0.6.1
Merge branch 'master' into gh-pages