Docs: update install and overview.

doc/source/install.txt

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+Installation from source
+------------------------
+
+Obtain the source from the git-repository at
+`http://github.com/stefanv/scikits.gpu
+<http://github.com/stefanv/scikits.gpu>`_.
+
+The SciKit can be installed globally using
+
+::
+
+  python setup.py install
+
+or locally using
+
+::
+
+  python setup.py install --prefix=${HOME}
+
+If you prefer, you can use it without installing, by simply adding
+this path to your PYTHONPATH variable and compiling extensions
+in-place::
+
+  python setup.py build_ext -i
+

doc/source/overview.txt

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+Image Processing SciKit
+=======================
+
+This SciKit (toolkit for `SciPy <http://www.scipy.org>`_) includes
+useful image processing algorithms for use with `Python
+<http://www.python.org>`_ and `NumPy <http://numpy.scipy.org>`_.
+While SciPy's ``ndimage`` provides low-level manipulation,
+``scikits.image`` centres around algorithms and applications.
+
+This `SciKit <http://scikits.appspot.com>`_ is developed by the SciPy
+community.  All contributions are most welcome!  Please join us on the
+mailing list (address provided below).
+
+Source, bugs and patches
+------------------------
+http://github.com/stefanv/scikits.gpu
+
+Mailing List
+------------
+http://groups.google.com/group/scikits-image
+
+Contact
+-------
+Stefan van der Walt <stefan at sun.ac.za>