Update sauce-connect-launcher to fix bogus error message

This manifests as an exit code 143 error. See
<https://github.com/bermi/sauce-connect-launcher/pull/12>
Added missing method `isEnabled` to `elementArgumentMethods`
Emit grunt events to after a test passes or fails

Closes #73
Add identified tunnel support.

This partially fixes issue #4 by enabling support for multiple
concurrent tunnels per access key.