bosh-bootstrap mosh connects to Inception VM using mobile friendly MOSH

For high latency or flakey internet connections (I'm looking at you 3G!), [MOSH](http://mosh.mit.edu/) is a better "terminal connection" than SSH.

This PR installs MOSH on the Inception VM, and adds the `bosh-bootstrap mosh` command to connect via MOSH rather than SSH.

You must have MOSH installed on your workstation - get it from http://mosh.mit.edu/#getting