clean up git version stuff a tad

lib/discourse.rb

@@ -45,8 +45,12 @@ module Discourse
   end
 
   def self.git_version
+    return $git_version if $git_version 
+    f = Rails.root.to_s + "/config/version"
+    require f if File.exists?("#{f}.rb")
+
     begin
-      $git_version ||= `git rev-parse HEAD`
+      $git_version ||= `git rev-parse HEAD`.strip
     rescue
       $git_version = "unknown"
     end