Add spring and fix controller specs

spec/support/matchers/broadcast_to_supplier_matcher.rb

@@ -41,6 +41,7 @@ module Matchers
     def failure_message
       "supplier #{@supplier_id} did not receive broadcast #{@message} with #{@target_object.inspect} #{@failure_debug_content}"
     end
+    def supports_block_expectations?; true; end
   end
 
   def broadcast_to_supplier(*args, &block)

spec/support/matchers/broadcast_to_user_matcher.rb

@@ -41,6 +41,7 @@ module Matchers
     def failure_message
       "user #{@user_id} did not receive broadcast #{@message} with #{@target_object.inspect} #{@failure_debug_content}"
     end
+    def supports_block_expectations?; true; end
   end
 
   def broadcast_to_user(*args, &block)