Coverall requirement breaks Windows install

[mwidman]

Upgrading to the latest version of Pyrax is difficult in Windows because of the inclusion of the "coveralls" module requirement. This module requires "sh" which only runs on Linux so Windows cannot install it, or coveralls, or pyrax.

I finally got around it by doing a bunch of "pip install --no-deps" but it was quite the nuisance.

[maxlinc]

Coveralls shouldn't be part of the installed package. It should only be required for development/testing.

@EdLeafe - the setup.py file appends testing_requires to install_requires. It should just be as simple as not appending, and using the tests_require list instead, but setuptools seems to take a different approach to test dependencies, and so getting nosetests to use those dependencies is a trickier than I expected. I tried to figure out some solutions, but you might want to ask someone who knows setuptools better what approach they suggest.

Trying things out I see three options:

• Use a pip requirements file for dev dependencies, like the last answer on this thread
• Configure python setup.py test to run the unit tests. This may make it harder to pass extra nose arguments from the command line, but I think they can be adjusted via setup.cfg.
• Configure python setup.py test to just install the eggs in the local directory, and find a way to get nosetests to load them from there.

This would completely avoid installing mock or coveralls except for testing, so would work around installing on windows. In order to make development possible on Windows, setup.py probably needs to detect windows adjust test_requires.