Unordered: Update change log.

[SVN r80776]

doc/changes.qbk

@@ -199,4 +199,21 @@ C++11 support has resulted in some breaking changes:
   for 64 bit values.
 * Some internal changes.
 
+[h2 Boost 1.51.0]
+
+* Fix construction/destruction issue when using a C++11 compiler with a
+  C++03 allocator ([ticket 7100]).
+* Remove a `try..catch` to support compiling without exceptions.
+* Adjust SFINAE use to try to supprt g++ 3.4 ([ticket 7175]).
+* Updated to use the new config macros.
+
+[h2 Boost 1.52.0]
+
+* Faster assign, which assigns to existing nodes where possible, rather than
+  creating entirely new nodes and copy constructing.
+* Reverted some of the internal changes to how nodes are created, especially
+  for C++11 compilers. 'construct' and 'destroy' should work a little better
+  for C++11 allocators.
+* Simplified the implementation a bit. Hopefully more robust.
+
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