Update jquery.ime from upstream

Upstream: https://github.com/wikimedia/jquery.ime
Changes:
* Optimize all SVGs.
* Removed unused images/ime-inactive.* files.
* Renamed: rules/README -> rules/README.md

Also, updated version in UniversalLanguageSelector.php

Change-Id: Ifd848da55e8ac68ef63fef5d435ecc23fc20e000