remove rack cache, it has been causing trouble

instead implement an aggressive anonymous cache that is stored in redis
this cache is sitting in the front of the middleware stack enabled only in production
TODO: expire it more intelligently when stuff is created

spec/components/middleware/anonymous_cache_spec.rb

@@ -0,0 +1,41 @@
+require "spec_helper"
+require_dependency "middleware/anonymous_cache"
+
+describe Middleware::AnonymousCache::Helper do
+
+  def new_helper(env={})
+    Middleware::AnonymousCache::Helper.new({
+      "HTTP_HOST" => "http://test.com",
+      "REQUEST_URI" => "/path?bla=1",
+      "REQUEST_METHOD" => "GET"
+    }.merge(env))
+  end
+
+  context "cachable?" do
+    it "true by default" do
+      new_helper.cacheable?.should be_true
+    end
+
+    it "is false for non GET" do
+      new_helper("ANON_CACHE_DURATION" => 10, "REQUEST_METHOD" => "POST").cacheable?.should be_false
+    end
+  end
+
+  context "cached" do
+    let!(:helper) do
+      new_helper("ANON_CACHE_DURATION" => 10)
+    end
+
+    after do
+      helper.clear_cache
+    end
+
+    it "returns cached data for cached requests" do
+      helper.cached.should be_nil
+      helper.cache([200, {"HELLO" => "WORLD"}, ["hello ", "world"]])
+      helper.cached.should == [200, {"HELLO" => "WORLD"}, ["hello world"]]
+    end
+  end
+
+end
+