Add data visualization page

It's not functional yet. The functionality will be implemented in CoffeeScript,
and the project needs CoffeeScript TDD set up. We'll do this with Jasmine.
Add visualize.js (currently empty)
Add jQuery to /visualize
Start building visualization functionality
Display all of the data in a basic fashion
Add /visualize to README
Merge pull request #26 from SmartReceipt/visualize

Add /visualize for debugging data in human-readable format