Add changelogs related to newly implemented AD number functionality.

diff --git a/doc/news/changes/minor/20171103Jean-PaulPelteret b/doc/news/changes/minor/20171103Jean-PaulPelteret
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+New: A uniform interface to automatically differentiable numbers that will
+be supported by the deal.II library has been implemented. A corresponding
+set of type traits classes that help query information about these numbers
+has also been implemented.
+<br>
+(Jean-Paul Pelteret, 2017/11/03)

diff --git a/doc/news/changes/minor/20171116Jean-PaulPelteret b/doc/news/changes/minor/20171116Jean-PaulPelteret
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+Changed: Core functions in the FEValues and FEValuesViews classes have been
+updated to allow the use of certain automatically differentiable numbers to
+represent degree-of-freedom values.
+<br>
+(Jean-Paul Pelteret, 2017/11/16)

diff --git a/doc/news/changes/minor/20171116Jean-PaulPelteret-1 b/doc/news/changes/minor/20171116Jean-PaulPelteret-1
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+New: Math operations for some automatically differentiable numbers have been
+extended. We also import some math functions for these number types into the 
+standard namespace. This gives full compatibility with the Tensor and
+SymmetricTensor classes, and facilitates the integration of these number types
+into existing code.
+<br>
+(Jean-Paul Pelteret, 2017/11/16)