[1.5.x] Added 1.5.1 release notes.

Backport of ae5247cb from master.

docs/releases/1.5.1.txt

@@ -0,0 +1,28 @@
+==========================
+Django 1.5.1 release notes
+==========================
+
+*March 28, 2013*
+
+This is Django 1.5.1, a bugfix release for Django 1.5. It's completely backwards
+compatible with Django 1.5, but includes a handful of fixes.
+
+The biggest fix is for a memory leak introduced in Django 1.5. Under certain
+circumstances, repeated iteration over querysets could leak memory - sometimes
+quite a bit of it. If you'd like more information, the details are in
+`our ticket tracker`__ (and in `a related issue`__ in Python itself).
+
+__ https://code.djangoproject.com/ticket/19895
+__ http://bugs.python.org/issue17468
+
+If you've noticed memory problems under Django 1.5, upgrading to 1.5.1 should
+fix those issues.
+
+Django 1.5.1 also includes a couple smaller fixes:
+
+* Module-level warnings emitted during tests are no longer silently hidden
+  (`#18985`__).
+* Prevented filtering on password hashes in the user admin (`#20078`__).
+
+__ https://code.djangoproject.com/ticket/18985
+__ https://code.djangoproject.com/ticket/20078

docs/releases/index.txt

@@ -21,6 +21,7 @@ Final releases
 .. toctree::
    :maxdepth: 1
 
+   1.5.1
    1.5
 
 1.4 release