Prepare for 1.7.6.3 maintenance release

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

Documentation/RelNotes/1.7.6.3.txt

+Git v1.7.6.3 Release Notes
+==========================
+
+Fixes since v1.7.6.2
+--------------------
+
+ * "git -c var=value subcmd" misparsed the custom configuration when
+   value contained an equal sign.
+
+ * "git reflog $refname" did not default to the "show" subcommand as
+   the documentation advertised the command to do.
+
+ * "git reset" did not leave meaningful log message in the reflog.
+
+ * "git status --ignored" did not show ignored items when there is no
+   untracked items.
+
+ * "git tag --contains $commit" was unnecessarily inefficient.
+
+Also contains minor fixes and documentation updates.

RelNotes

-Documentation/RelNotes/1.7.6.2.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.6.3.txt
\ No newline at end of file