Mike Bayer committed 7393c16

updated verbiage for 0.5beta1 release

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+    - An ongoing document describing the changes from 0.4 to 0.5
+      is at:
+      For this section, the list below primarily lists changes 
+      within the attribute instrumentation API and is only a
+      small fraction of the full changes between 0.4/0.5.
     - The "__init__" trigger/decorator added by mapper now attempts
       to exactly mirror the argument signature of the original
       descriptors attached to the class.  A deprecation warning will
       be issued when accessed.
-    - attribute savepoint/rollback capability has been added.  For
-      starters, this takes effect within the flush() call, so that
-      attribute changes which occur within flush() are rolled back
-      when the flush fails.  Since it's primarily new primary key
-      values that get assigned within flush(), expiring those
-      attributes is not an option.  The next place we might use
-      savepoints is within SAVEPOINT transactions, since rolling
-      back to a savepoint is a transaction-contained operation.
     - The _prepare_instrumentation alias for prepare_instrumentation
       has been removed.
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