New feature : Spring Expression language as a part of router configuration

Hi all,

I would like to add new feature, usage of Spring Expression language inside of router configuration. In the past I asked this feature via Google Groups/Mailing list.
https://groups.google.com/forum/#!topic/membrane-monitor/ski_hyYjUNY

Now I've also implementation for this requirement.
For usage You could see cli/examples/spel
    <router>
        <serviceProxy name="predic8.com" port="#{myProp.LISTEN_PORT}">
            <path isRegExp="#{myProp.PATH_RE}">.*</path>
            <target host="#{myProp.DEST_HOST}" port="#{myProp.DEST_PORT}" />
        </serviceProxy>
    </router>