ENYO-2694: support npm-1.3.x (comes with node-0.8.25)
ENYO-2694: map plugins static files as `/res/plugins/<service-id>/*`

Instead of each plugin to have to run its own Node.js server (even when
there is no logic in addition to templates/libs/sources), this change
causes ares to centralize static file mapping.
Merge pull request #387 from enyojs/ENYO-2694

ENYO-2694: map plugins static files as `/res/plugins/<service-id>/*` …