Fix specs with mismatched arg calls

Author: jaswope

lib/rack/reverse_proxy.rb

@@ -4,7 +4,7 @@
 module Rack
   class ReverseProxy
     def initialize(app = nil, &b)
-      @app = app || lambda { [404, [], []] }
+      @app = app || lambda {|env| [404, [], []] }
       @matchers = []
       @global_options = {:preserve_host => true, :matching => :all, :verify_ssl => true}
       instance_eval &b if block_given?

spec/rack/reverse_proxy_spec.rb

@@ -9,15 +9,14 @@ def app
   end
 
   def dummy_app
-    lambda { [200, {}, ['Dummy App']] }
+    lambda { |env| [200, {}, ['Dummy App']] }
   end
 
   describe "as middleware" do
     def app
       Rack::ReverseProxy.new(dummy_app) do
         reverse_proxy '/test', 'http://example.com/', {:preserve_host => true}
-        reverse_proxy '/2test', lambda{'http://example.com/'}
-
+        reverse_proxy '/2test', lambda{ |env| 'http://example.com/'}
       end
     end