* Disable doesn't work for radio buttons
* After API refactoring the input items are not shown on document ready, therefor the even doesn't hide/disable them.
Add german translation.
Remove checkout_states helper for Spree 1.3.x support. [Fix #120]
Merge branch '1-3-stable' of https://github.com/JohanB/spree_paypal_express into 1-3-stable
Fix: Do not redirect to paypal if there is an error on the Order model

In case there is a validation issue with the Spree::Order we do not
want to redirect to the paypal page but resolve the error.
Fixing duplicate payment creation for non paypal payment methods
Preventing duplicate  payment stuck at checkout state for successful paypal payments
Only parametize gateway errors if the locale is not :en. [Fix #112]
Merge branch '1-3-stable' of https://github.com/robertoles/spree_paypal_express into 1-3-stable
Merge remote-tracking branch 'spree/1-3-stable' into 1-3-stable