Fix warning about "comparison between signed and unsigned" in example and make it fully C89 compatible.

Added tests for the convolve with the memoryviews in the docs.

Remove redundant helper function "__Pyx_ImportModule()" which was only needed in Py<2.6 when PyObject_GetAttrString() and PyImport_ImportModule() did not take const string arguments.

Mark several one-time functions (used during module init) with CYTHON_SMALL_CODE to reduce their binary code impact on the overall module size.

Avoid some overindentation in the generated C code due to duplicated opening braces inside of C macros.

Add tutorial on how to call C function with numpy arrays.

Corrected the description of a test option.

[Docs][Ready for Review] Added documentation on extension class instanciation from existing pointer

Fix error reporting on very early errors when the Cython runtime configuration module is not set up yet.
See #2199.

Made code examples in the docs compatible with python 2 and 3.

See #2279.

Fixing c library tutorial

Added a C++ example in the cython tutorial.

Make non-standard Extension attributes "py_limited_api" and "np_pythran" optional for cycache fingerprinting.

Added a documentation for the Cythonize function and its arguments.