https and protocol-less url support

Made some minor changes to ```qtrans_convertURL``` in order to support https and protocol-less urls.
Fixed ```qtrans_parseURL``` to work with protocol-less urls. Note that php's own ```parse_url``` does not work correctly in versions below 5.4.7: http://php.net/manual/en/function.parse-url.php

Also included a js fix related to js post excerpt handling and WooCommerce shop_order post types.