Add a js-min-watch gulp target.
Add a js-min-watch gulp target.

sparhami/incremental-dom,google/incremental-dom,google/incremental-dom,PolymerLabs/incremental-dom,PolymerLabs/incremental-dom,google/incremental-dom,sparhami/incremental-dom,PolymerLabs/incremental-dom,jridgewell/incremental-dom,sparhami/incremental-dom,jridgewell/incremental-dom,sparhami/incremental-dom,jridgewell/incremental-dom