Made the readme pretty for github.

Fix one word typo

changes the text "may or be not be" to "may or may not be"

Made the print python 3 style. pep8 and link to memoryviews.

Updated cythonize.

Put the pip installation first.

Improvements of the docs.

Split prototype part off a utility function to move the actual implementation to the end of the C file.

Misc typos

Found via `codespell`

Closes #1606.

Mention Typed Memoryviews in the Working with NumPy doc.

Updated the example for --annotate.

Increase the ccache size on travis from 100M to 150M as we've probably passed the limit already with all the tests that we have now.

Do not issue "redefined" warnings on C++ function overrides with different signatures (previously only applied to methods).
Closes #2013.

Actually show "redefined" warnings, but only for "cdef extern" blocks, i.e. the exact case described in #1874.
Closes #1874.