Add a manifest, since setuptools doesn't support hg.

Also add a few more things to hgignore file.

MANIFEST.in

@@ -0,0 +1,22 @@
+include README
+include LICENSE
+include AUTHORS
+include CHANGES
+include EXAMPLES
+include TODO
+
+include babel.cfg
+include Makefile
+include ez_setup.py
+include sphinx-build.py
+include sphinx-quickstart.py
+
+recursive-include sphinx/texinputs *.*
+recursive-include sphinx/templates *.html *.xml
+recursive-include sphinx/static *.*
+recursive-include sphinx/locale *.*
+recursive-include tests *.*
+recursive-include utils *.*
+
+recursive-include doc *.*
+prune doc/_build