Start preparing for 1.7.12.3

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.7.12.3.txt

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+Git 1.7.12.3 Release Notes
+==========================
+
+Fixes since v1.7.12.2
+---------------------
+
+ * "git fetch" over http had an old workaround for an unlikely server
+   misconfiguration; it turns out that this hurts debuggability of the
+   configuration in general, and has been reverted.
+
+ * "git fetch" over http advertised that it supports "deflate", which
+   is much less common, and did not advertise the more common "gzip" on
+   its Accept-Encoding header.
+
+ * "git status" honored the ignore=dirty settings in .gitmodules but
+   "git commit" didn't.
+
+Also contains a handful of documentation updates.

RelNotes

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-Documentation/RelNotes/1.7.12.2.txt
+Documentation/RelNotes/1.7.12.3.txt