Collected improvements requested by others.

This message is meant to enforce a style that favors micro-optimizations
and doesn't seem necessary.

Added Travis CI configuration

Better docs about how to change generated files

- Added .travis.yml
- Corrected dev/install dependencies
- Added make target for requirements

Fixes #22

Upgraded to Pylint 1.5.x

- Updated Pylint requirement (limiting to <1.6.0) to avoid future breakages
- Removed obsolete configuration options
- Fixes #24

Also check delattr for literal-used-as-attribute

Make edx-lint commands work with both python2 and python3

Make it work on Python 3

Use pylint-django

Add lxml to C-extension whitelist.

Allow "class Meta" with no docstring.

Also, pin the ends of the regex to be stricter.

mattdrayer/increment-version: Bump to v0.2.9

New Checker for Renegade assertTrue/False

2. Also catch the "not in" case.

https://github.com/edx/edx-platform/blob/master/CONTRIBUTING.rst

https://github.com/Sveder/custom-lints

Prepare package for distribution on PyPI

Bump version to 0.2.7

This is a silly pylint warning: we already get warned about wildcard
imports, we don't need to see dozens more about all of the imported
names that we didn't use.

Checker for tests inheriting from tests