Start 1.7.5.4 draft release notes

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

Documentation/RelNotes/1.7.5.4.txt

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+Git v1.7.5.4 Release Notes
+==========================
+
+Fixes since v1.7.5.3
+--------------------
+
+ * The single-key mode of "git add -p" was easily fooled into thinking
+   that it was told to add everthing ('a') when up-arrow was pressed by
+   mistake.
+
+ * "git diff -C -C" used to disable the rename detection entirely when
+   there are too many copy candidate paths in the tree; now it falls
+   back to "-C" when doing so would keep the copy candidate paths
+   under the rename detection limit.
+
+ * "git rerere" did not diagnose a corrupt MERGE_RR file in some cases.
+
+And other minor fixes and documentation updates.

RelNotes

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-Documentation/RelNotes/1.7.5.3.txt
+Documentation/RelNotes/1.7.5.4.txt