- send sku alongside name to paypal - send line items on purchase step (last step) to paypal, so it shows up in the paypal backend and in emails

Fixes #36
Fixes #43
Added ecommerce flash

Fixes #41
Add utm_nooverride as per this spree user thread:

https://groups.google.com/forum/#!topic/spree-user/uScFGdiX_DE
Add landing page prerence, fix header image preference + documented currently supported preferences
fix: gateway skipped sending shipping total etc

Fixes #45
Fixes #46
Only use additional tax adjustments
Use GET route for paypal_express_url to fix random CSRF issues reported by @dpritchett & co
Use Spree::Core::Engine.add_routes to draw routes (if it exists)

Conflicts:
	config/routes.rb
Fix pay_pal_express_spec model by stubbing more of the right things