Pytest-pep8

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- fix tests to accomodate newer pep version which is more sensitive
to detecting "E265 too many spaces"

- add py34 to tox.ini

- clarified in setup.py that license is MIT

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- use pytest-2.4.2 node.add_marker() API for adding "pep8" marker

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- fix issue2: make pep8 interoperate with --strict runs

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- added pep8maxlinelength ini setting to configure the maximum allowed
line length.
- add tox.ini and test_pep8.py to distribution

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- fix a parsing bug - is now recognized as
as comment and ALL will now be recognized
even if other codes are specified (nonsensically)

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- add pytest-cache dep to setup.py