Finish Balanced Payments Support.

Fixes #63
renamed Balanced to BalancedGateway to avoid namespacing issue with Balance gem for their API

Fixes #62
added test for BalancedGateway

Related to #62
Rename Stripe gateway to StripeGateway

Fixes #60
update Stripe payment method type to StripeGateway

Fixes #65
Fixing spelling mistake in preferred_discover_login attribute in Worldpay
gateway

Changing attr_accessible prefered_discover_login to include second r, so that world pay payment methods can be created / updated
no need for activemerchant dependency, as spree_core already has one
Move factory_girl_rails dependency to gemspec
Fix class reference for CheckoutController in spec
Remove debugger gem references from gemfile
Remove skrill_status_controller_spec, which is empty
Fix classname for QuickCheckout spec
add support for CardSave gateway

Fixes #70
Bump copyright
Remove useless SkrillStatusController spec
Remove broken Skrill tests

SkrillAccount is gone AWOL. Restore this commit when Skrill is figured out

Conflicts:
	spec/models/billing_integration/skrill_spec.rb
Correct factory calls within braintree_gateway_spec
Correct path to common_rake within Rakefile
merge in changes from github.com/spree/spree_usa_epay

Fixes #71
lock savon to 1.2

Fixes #71