Optimized/compressed images (through ImageOptim)
Merge pull request #7 from j9t/master

Optimized/compressed images (through ImageOptim)
add tool for automated creation of JSON

The elements.json is auto-updated from index.html by
means of bin/create_json.js. It's a node.js script,
and its prerequisites (only jsdom) are automatically
fetched, when the Makefile is invoked:

$ make