Always chown basedir

Fixes #36
dedupe install options
Upgrade strong-service-install to 1.0.0

Add test for sl-pm path in generated init script to ensure the
installer is generating correct jobs.

New version includes bug fixes for environment variables and execPath
handling.
Add --metrics option to pm-install

Sets the STRONGLOOP_METRICS environment variable in the init script.

For strongloop-internal/scrum-nodeops#99

See also #27