Makefile: rework repo creation target

Cython/Debugger/Cygdb.py: Add debug logging with `logging` module

Add testcase for cimport+alias+subclass bug

Cython/Debugger/Cygdb.py: Source .cygdbinit file

setup.py: [0.19.x] Use setuptools when invoked with bdist_{egg,wheel}.

added __version__ to the cython namespace

This makes it easier to build eggs and wheels of 0.19.x releases; the
master branch already uses setuptools.

Fix cygdb argument parsing

The "--" needs to be put before any gdb args so that optparse doesn't think that they're cygdb args.

.gitignore: Ignore *.egg and *.egg-info