Test index page

This branch adds a `test/index.html` which displays a listing of test pages using a customized OnDemandGrid instance.  The listing is pulled from a JSON file generated by a node.js script, both of which have been added under `test/data`.

Given that the build process does not typically process test resources for building, no `package.js` modifications were necessary to avoid the build tripping over / warning about the node.js script.