Set payment method to none

By default Solidus is now looking for `solidus_paypal_commerce_platform`,
however, with the sandbox and the dummy generator we need to set this
to `none`, otherwise these scripts are not running successfully.

This commit fixes that. It does not update the application template for Heroku
though. That will be a seperate PR.

Author: peterberkenbosch

bin/sandbox

@@ -66,6 +66,7 @@ unbundled bin/rails generate solidus:install \
   --user_class=Spree::User \
   --enforce_available_locales=true \
   --with_authentication=false \
+  --payment-method=none
   $@
 
 unbundled bin/rails generate solidus:auth:install

core/lib/spree/testing_support/common_rake.rb

@@ -14,7 +14,7 @@
     ENV["RAILS_ENV"] = 'test'
 
     Spree::DummyGenerator.start ["--lib_name=#{ENV['LIB_NAME']}", "--quiet"]
-    Solidus::InstallGenerator.start ["--lib_name=#{ENV['LIB_NAME']}", "--auto-accept", "--with-authentication=false", "--migrate=false", "--seed=false", "--sample=false", "--quiet", "--user_class=#{args[:user_class]}"]
+    Solidus::InstallGenerator.start ["--lib_name=#{ENV['LIB_NAME']}", "--auto-accept", "--with-authentication=false", "--payment-method=none", "--migrate=false", "--seed=false", "--sample=false", "--quiet", "--user_class=#{args[:user_class]}"]
 
     puts "Setting up dummy database..."