Release 1.6.9

Changes since 1.6.8:
 - shipper now sorts users by active status first.
 - New management command to get the statistics of shipper has been added (`calculate_statistics`)
 - SourceForge keys have been removed from the environment configuration file. Refer to the upgrade instructions for more info.
 - New mirror server table has been added. Add all mirror servers here.
 - Incorrect model verbose names have been fixed.
 - shipper now prints upload progress while mirroring a build to a mirror server.

version.txt

@@ -1 +1 @@
-1.6.8
+1.6.9