[Reviewer: Mike] Ignore port number when deciding whether Route header refers to us

Mike, please can you review my fix to [issue 63](https://github.com/Metaswitch/sprout/issues/63) to ignore the port number when deciding whether a Route header refers to us?

I've run the UT (but not enhanced them because we don't yet have a good infrastructure for WS UT).  I've also run the live test and tested the fix myself.  I can now successfully establish a signaling path between sipml5 and Boghe, but media is failing - I'm still looking into that, but am sure it's not related to this.