Checking in changes prior to tagging of version 1.12.

Changelog diff is:

diff --git a/CHANGES b/CHANGES
index 4a9eb24..5c45819 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+1.12 (2014-12-14)
+
      -- Repoint HACKING file.

      -- Make a jobserver connection use the command timeout during exception negotiation.