Improvements for Skrill gateway

Fixes #89
Remove require for pry from pin_gateway_spec
send bill_to phone and email to authorize.net

Fixes #67
Partial for #66
Add PayJunction gateway and tests

Fixes #92
Remove attr_accessible and friends
Remove SpreeSkrill engine

Cant see any use for it and it was causing routes errors because it
loaded routes.rb file twice and therefore defined the same named route
twice
Clean up rspec DEPRECATION WARNINGs
Include FactoryGirl::Syntax::Methods in spec_helper