[Build/Dependencies] added a comparision for setuptools.Extension class

This is done with the T=* syntax, similar to default args
of cdef methods.

This does, however, expose us to types that we can't
explicitly declare.

Optimize dependency checking

Ensure that extension's include_dirs is a list

This change allows to pass generator (e.g. itertools.chain) as
include_dirs if for some reason evaluation of include directories needs
to be delayed e.g. due to simultaneous dependency on cython and numpy.

Fix parse_list("")

Use correct macros to check GCC version

use slightly faster PyObject_Malloc() instead of PyMem_Malloc() for small memory allocation needs (<= 512 bytes)

Cpp iterator declarations.

Don’t crash when a C class isn’t defined in the pxd

Fix typo in numpy tutorial

Hide some parts of stack trace in __PYX_ERR macro

These were already failing when this was added to the build matrix.

Enable tests on python 3.5-dev

Enable tests on python 3.5-dev to catch problems with upcoming python releases early.

Set up c_code_config options properly when autogenerating header files.

Fix generated `#line` directives on Windows

errors from incorrect escape sequences when compiling on Windows.

update error message in __Pyx_ImportType when basicsize doesn't match

match.

Changes the error message to include the sizes of the two
structures. This aids in debugging the it allows us to check the sizes
to see which version we were built against versus the version we have at
runtime.