box / ClusterRunner / 1267

5%

Pull #275

travis-ci

Bump pylint to 1.5.1

This fixes currently failing lint jobs. I also regenerated the
pylintrc file (`pylint --generate-rcfile`) and added back some of our
custom rule ignores.

Pylint 1.4.2 has an incompatibility with the newest version of one of
its dependencies (astroid). This has started causing our lint jobs to
fail with a bunch of errors that look like:

```
E: 37, 8: Undefined variable 'self' (undefined-variable)
```

Since we have only specified exact versions of our dependencies in
requirements.txt (and not the exact versions of dependencies'
dependencies, etc.) it's still possible for third party libraries to
break something without a change on our side.

We should switch over to using peep
(https://pypi.python.org/pypi/peep) or something similar.

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