Lazily initialize Contact proxy in service helper

This prevents connecting to the database on rake assets:precompile,
which fails in certain build environments.

Running git blame on this and figuring out what in gods name this
is for, is for another time.

app/helpers/services_helper.rb

@@ -1,6 +1,11 @@
 module ServicesHelper
-  @@contact_proxy = Contact.new(:aspects => [])
   def contact_proxy(friend)
-    friend.contact || @@contact_proxy.dup.tap{|c| c.person = friend.person}
+    friend.contact || contact_proxy_template.dup.tap {|c| c.person = friend.person }
+  end
+
+  private
+
+  def contact_proxy_template
+    @@contact_proxy ||= Contact.new(:aspects => [])
   end
 end