Auto-rebuild has stopped working in 3.5.12

[randomsock]

Possibly a result of Needless npm rebuild after updating refs #65

If I update an app, and the HEAD has moved, it picks that up and does update the codebase, but the auto npm rebuild that used to happen doesn't, even in this case.

For example (redacted but faithful):

$ guv stop myapp
$ guv updaterefs myapp
HEAD is now at 58c161c Previous commit message ...
Fetching origin
From ssh://stash.acme.net:7999/projects/myapp
   58c161c..ad2e29d  master     -> master
HEAD is now at ad2e29d Latest commit message ...
HEAD is now at ad2e29d Latest commit message ...
Already on 'master'
current ref now
$