Percent decoding on validate fluid URI

This PR would allowing validate URI like `100%25x60` to be percent decoding to `100%x60` as desired setting.

> Because the percent ("%") character serves as the indicator for percent-encoded octets, it must be percent-encoded as "%25" for that octet to be used as data within a URI. -- [rfc3986#section-2.4](http://tools.ietf.org/html/rfc3986#section-2.4)