Move to testing with pycodestyle instead of pep8

[machawk1]

Guido recommended not using pep8 to describe the module to test for PEP8 compliance. Testing using the pep8 module ought to be move to use pycodestyle instead. Supposedly the package is feature-equivalent with pep8 but that is not longer true per my experience. Additional tests may have been added to pep8/pycodestyle to be stricter to the PEP8 style guide.

[grantat]

Some Travis build ouput:

pep8 has been renamed to pycodestyle (GitHub issue #466)
Use of the pep8 tool will be removed in a future release.
Please install and use `pycodestyle` instead.

So I suppose switching over is a good idea at this point. I'm also getting E722 in a few files:

(venv) Grants-MBP:CarbonDate gatkins$ pycodestyle --ignore=E501 main.py ./modules/
./modules/cdGetArchives.py:139:5: E722 do not use bare except'
./modules/cdGetBacklinks.py:37:5: E722 do not use bare except'
./modules/cdGetBacklinks.py:66:5: E722 do not use bare except'
./modules/cdGetBing.py:29:5: E722 do not use bare except'
./modules/cdGetBitly.py:30:5: E722 do not use bare except'
./modules/cdGetBitly.py:59:9: E722 do not use bare except'
./modules/cdGetBitly.py:129:5: E722 do not use bare except'
./modules/cdGetFirstAppearanceInArchives.py:25:5: E722 do not use bare except'
./modules/cdGetFirstAppearanceInArchives.py:110:5: E722 do not use bare except'
./modules/cdGetGoogle.py:99:9: E722 do not use bare except'
./modules/cdGetLowest.py:45:9: E722 do not use bare except'
./modules/cdGetLowest.py:83:9: E722 do not use bare except'
./modules/cdGetPubdate.py:18:5: E722 do not use bare except'

[hugovk]

The pep8 tool was renamed to pycodestyle, and development continues as pycodestyle.

So running pep8 is essentially the same as running an old version of pycodestyle.