Initial implementation of allowing cross-origin requests in the webfinger...

Initial implementation of allowing cross-origin requests in the webfinger flow, so that the unhosted guys can use Diaspora.  May not work with caches-page on host-meta.  We'll have to use X-Accel-Redirect or something.

app/controllers/publics_controller.rb

@@ -10,6 +10,11 @@ class PublicsController < ApplicationController
   skip_before_filter :set_invites
   skip_before_filter :which_action_and_user
   skip_before_filter :set_grammatical_gender
+  before_filter :allow_cross_origin, :only => [:hcard, :host_meta, :webfinger]
+
+  def allow_cross_origin
+    headers["Access-Control-Allow-Origin"] = "*"
+  end
 
   layout false
   caches_page :host_meta