Add "auto/" scripts for integration tests.

[refs #67315452]
Upgrade to Karma 0.12. Fix the build.

Karma's upgrade made "npm install" fail, because we requested Karma 0.10
but some other dependencies' newest versions depended on Karma 0.12.

I've tested these, and they work:

* auto/test-coffee.sh (edit file -> tests re-run)
* auto/test-coffee-once.sh (which Travis-CI uses)