Don't install gaiohttp if python < 3.3

[asvetlov]

See #788
That prevents syntax warning on library installation step.
The patch enumerates all python modules directly without handy autodiscovery (setuptools.find_packages).
It still uses setuptools for making console scripts etc, I don't think that we need to remove it.

[davisp]

Looks like you're not collecting from the tests/ directory.

[asvetlov]

Yes, I don't include tests/ and examples/ in list of installed modules -- they are not included for now also:
packages = find_packages(exclude=['examples', 'tests']),

python setup.py sdist adds everything into gunicorn-xx.x.x.tar.gz archive but installing this distribution doesn't install gunicorn.workers.gaiohttp module if python < (3, 3)

[asvetlov]

@benoitc please review

[davisp]

Derp. My bad. I was just skimming to check that it wasn't a behavior change and misread exclude as include.

+1

[asvetlov]

@davisp no problem, thanks.

[benoitc]

+1 LGTM

[asvetlov]

Done!

[nrvnrvn]

So now pypi package does not contain gaiohttp.py file, resulting in

Traceback (most recent call last):
  File "/home/nrevin/.virtualenvs/venv/lib/python3.4/site-packages/gunicorn/util.py", line 139, in load_class
    mod = import_module('.'.join(components))
  File "/home/nrevin/.virtualenvs/venv/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2224, in _find_and_load_unlocked
ImportError: No module named 'gunicorn.workers.gaiohttp'

[benoitc]

@nicorevin thanks for the feedback, working on it in #830 . I will make a new release later today.