Update whatsnew from PR files

docs/source/whatsnew/development.rst

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 =====================
  Development version
 =====================
 
 This document describes in-flight development work.
 
 .. warning::
 
     Please do not edit this file by hand (doing so will likely cause merge
     conflicts for other Pull Requests). Instead, create a new file in the
     `docs/source/whatsnew/pr` folder
 
 
 - `%%capture` cell magic now captures the rich display output, not just
   stdout/stderr
 
 Select Notebook Name When Renaming a Notebook
 ---------------------------------------------
 
 The default notebook name is Untitled. It's unlikely you want to keep this name
 or part of it when naming your notebook. Instead, IPython will select the text
 in the input field so the user can easily type over the name and change it.
 
 clear_output changes
 --------------------
 
 * There is no longer a 500ms delay when calling ``clear_output``.
 * The ability to clear stderr and stdout individually was removed.
 * A new ``wait`` flag that prevents ``clear_output`` from being executed until new
   output is available.  This eliminates animation flickering by allowing the
   user to double buffer the output.
 * The output div height is remembered when the ``wait=True`` flag is used.
 
+Extending Configurable Containers
+---------------------------------
+
+Some configurable traits are containers (list, dict, set)
+Config objects now support calling ``extend``, ``update``, ``insert``, etc.
+on traits in config files, which will ultimately result in calling
+those methods on the original object.
+
+The effect being that you can now add to containers without having to copy/paste
+the initial value::
+
+    c = get_config()
+    c.InlineBackend.rc.update({ 'figure.figsize' : (6, 4) })
+
+ * In notebook, Showing tooltip on tab has been disables to avoid conflict with
+   completion, Shift-Tab could still be used to invoke tooltip when inside
+   function signature and/or on selection.
+
+Single codebase Python 3 support
+--------------------------------
+
+IPython previously supported Python 3 by running 2to3 during setup. We
+have now switched to a single codebase which runs natively on Python 2.7
+and 3.3.
+
+For notes on how to maintain this, see :doc:`/development/pycompat`.
+
+* ``object_info_request`` as been replaced by ``object_info`` for consistency in the javascript API.
+  ``object_info`` as a simpler interface to register callback that is incompatible with ``object_info_request``.
+
+* Previous versions of IPython on Linux would use the XDG config directory,
+  creating :file:`~/.config/ipython` by default. We have decided to go
+  back to :file:`~/.ipython` for consistency among systems. IPython will
+  issue a warning if it finds the XDG location, and will move it to the new
+  location if there isn't already a directory there.
+
+* Equations, images and tables are now centered in Markdown cells.
+* Multiline equations are now centered in output areas; single line equations
+  remain left justified.
+
 .. DO NOT EDIT THIS LINE BEFORE RELEASE. FEATURE INSERTION POINT.
 
 Backwards incompatible changes
 ------------------------------
 
 * Python 2.6 and 3.2 are no longer supported: the minimum required
   Python versions are now 2.7 and 3.3.
 * The Transformer classes have been renamed to Preprocessor in nbconvert and
   their `call` methods for them have been renamed to `preprocess`.
 * The `call` methods of nbconvert post-processsors have been renamed to
   `postprocess`.
 
 * The module ``IPython.core.fakemodule`` has been removed.
 
 * The alias system has been reimplemented to use magic functions. There should be little
   visible difference while automagics are enabled, as they are by default, but parts of the
   :class:`~IPython.core.alias.AliasManager` API have been removed.
 
 * We fixed an issue with switching between matplotlib inline and GUI backends,
   but the fix requires matplotlib 1.1 or newer.  So from now on, we consider
   matplotlib 1.1 to be the minimally supported version for IPython. Older
   versions for the most part will work, but we make no guarantees about it.
 
 * The :command:`pycolor` command has been removed. We recommend the much more capable
   :command:`pygmentize` command from the `Pygments <http://pygments.org/>`_ project.
   If you need to keep the exact output of :command:`pycolor`, you can still use
   ``python -m IPython.utils.PyColorize foo.py``.
 
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