ship C-file

Shipping the generated C-files to pypi is a good idea since it is less error-prone. A New Cython version might deal with the provided pyx file in a way we did not intend.

In more detail the best practice can be found here: http://blog.behnel.de/posts/ship-generated-c-code-or-not.html

MANIFEST.in

@@ -2,6 +2,5 @@ include README.md
 include COPYING.txt
 include RELEASE-VERSION
 global-include *.pyx
-global-exclude boundaries/createindexlistcython.c
 include versioneer.py
 include pystencils/_version.py