Add sample intro.js demo and intro banner
Link from welcome page to individual campaigns
Fix alignment of campaign state
Add more images for rotation
Shift the images around in order
Remove intro_disabled helper
Add a dialog tour
Merge branch 'master' into add_js_tour

Conflicts:
	app/views/layouts/application.html.erb
	app/views/shared/_analytics.html.erb
Remove unused intro.js
Remove unused introjs CSS
Rename demo JS
Make sure the demo is restarted when the user clicks on start seller/buyer demo
Copy change
Linkify entire campaign thumbnail
Change profile link to My Campaigns and bring the campaigns list up higher
Convert the production host back to wecrowd.wepay.com
Revert host change
Remove the CSRF check for IPN POST requests