Add a MANIFEST.in file.

The second line is a horrible hack, but I really do not know why this
file is not included by default since it is referenced from
scikits/learn/machine/manifold_learning/setup.py

git-svn-id: https://scikit-learn.svn.sourceforge.net/svnroot/scikit-learn/trunk@371 22fbfee3-77ab-4535-9bad-27d1bd3bc7d8

MANIFEST.in

+include AUTHORS COPYING
+include scikits/learn/machine/manifold_learning/regression/cluster/ModifiedGeneralClustering.i
\ No newline at end of file