router on heroku

[quartzjer]

test and document how to do this, cc #27

[trlim]

From my experiment, running router instance on heroku simply crashes after printing final prompt message.
This seems to be solved by running with --norepl option. (I had to comment out all mesh.rlog calls for this).
And there is a code error in router.js which fails to assign process.env.PORT to argv.http.port.

[quartzjer]

I started down this road a couple weeks ago and got side-tracked, it's definitely working its way back up the TODO list, I want this to work flawlessly (and no reason it shouldn't).