set default_currency before every spec context

Author: yukideluxe

spec/spec_helper.rb

@@ -114,7 +114,7 @@
   Kernel.srand config.seed
 
   # Code to run once before the entire test suite
-  config.before(:suite) do
+  config.before(:context) do
     Money.default_currency = Money::Currency.new("USD")
   end
 end