bridge-camel example does not build unless bridge example was built first

On a fresh maven repo and ServiceMix installation, if you build the bridge-camel example before building the bridge example, the bridge-camel example is unable to find the bridge-http-su and bridge-jms-su.

We should either add a note to the README to explain that the bridge-camel example builds on top of the bridge example or else include something like this in the bridge-camel pom.xml

<!-- we reuse the bridge-http-su/bridge-jms-su from the plain bridge demo -->
<module>../bridge/bridge-http-su</module>
<module>../bridge/bridge-jms-su</module>