rb: Add the path to gen-rb to $: in spec_helper instead of in multiple different specs


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@669017 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/rb/spec/spec_helper.rb b/lib/rb/spec/spec_helper.rb
index 874ed2d..9498d2a 100644
--- a/lib/rb/spec/spec_helper.rb
+++ b/lib/rb/spec/spec_helper.rb
@@ -13,6 +13,7 @@
 end
 
 require File.dirname(__FILE__) + '/../lib/thrift'
+$:.unshift File.dirname(__FILE__) + "/gen-rb"
 
 class Object
   # tee is a useful method, so let's let our tests have it