Add highchart library
Reformat js client side
Add markup to display items chart
Add new route for categories
Add categories middleware to app.js
Fix association between item and category
Implement method for categories controller to return all stats
Add client side script to render pie chart
Add style to show chart button
Bind js method to show graph button
Add method to show and hide chart in client side js
Add pie chart
Merge branch 'develop' of https://github.com/antimatter-wpi/tradizon into develop

Conflicts:
	app.js
	public/javascript/index-signedin-script.js
	views/layout.jade