AUI-1667

Hey @ipeychev,

Attached is an update for http://issues.liferay.com/browse/AUI-1667.  Can you review this since it reverts the commits for AUI-962 (https://github.com/liferay/alloy-ui/commit/4a21f4ab7ac29b31641714c9e113bdcb0c156d06).  I think we can revert this since we are limiting the type of characters to be entered into the tag selector https://github.com/liferay/liferay-portal/blob/master/portal-web/docroot/html/js/liferay/asset_tags_selector.js#L20..L49

Please let me know if you have any questions.  Thanks!