Added test-auto-watch target
Added test-auto-watch target

This switches the old `npm run test-single-run` to
`npm run test-auto-watch`, which I feel is a little more useful
for day-to-day development. It'll rerun tests whenever it detects
changes in its configured files.

Change-Id: I453c47794cb0a4777cd1fac64b2db3000020f5bf
Depends-on: I26fc5b1f780453202af8d1d43575bbf2aa53d27e

stackforge/refstack,stackforge/refstack,openstack/refstack,openstack/refstack,stackforge/refstack,markvoelker/refstack,markvoelker/refstack,markvoelker/refstack,openstack/refstack,openstack/refstack,markvoelker/refstack,stackforge/refstack