PERF: use raw rendering for topic list

rename my handlebars helper to "raw",
create ember compat handlebars to handle rendering
patch ember rails to use the correct precompiler

lib/freedom_patches/ember_compat_handlebars.rb

@@ -0,0 +1,36 @@
+# barber patches to re-route raw compilation via ember compat handlebars
+#
+
+module Barber
+  class EmberCompatPrecompiler < Barber::Precompiler
+
+    def self.call(template)
+      "Handlebars.template(#{compile(template)})"
+    end
+
+    def sources
+      [handlebars, precompiler]
+    end
+
+    def precompiler
+    @precompiler ||= StringIO.new <<END
+      var Discourse = {};
+      #{File.read(Rails.root + "app/assets/javascripts/discourse/lib/ember_compat_handlebars.js")}
+      var Barber = {
+        precompile: function(string) {
+          return Discourse.EmberCompatHandlebars.precompile(string).toString();
+        }
+      };
+END
+    end
+  end
+end
+
+class Ember::Handlebars::Template
+  def precompile_handlebars(string)
+    "Discourse.EmberCompatHandlebars.template(#{Barber::EmberCompatPrecompiler.compile(string)});"
+  end
+  def compile_handlebars(string)
+    "Discourse.EmberCompatHandlebars.compile(#{indent(string).inspect});"
+  end
+end