Add dgrid-powered test index page + script to generate JSON
Persist expanded state and scroll position of test index page
Fix old-IE issues with test index page
Make createIndex output prettified JSON for easier diffing
Render actual links to allow ctrl/cmd/middle/right-click to work
Fix renderCell function for empty values

Ironically, this broke in all browsers from when I was fixing old IE.
Fix renderCell function for parents (don't make links)
Merge pull request #407 from kfranqueiro/test-index

Add test index page