Update pylint instructions in README; make pylint and pep8 requirements (instead of just test requirements)
Merge pull request #68 from edx/will/update-pylint-readme

Update pylint instructions in README; make pylint/pep8 actual requirements
Add support for python 3.4
Add myself to authors file
Make .travis.yml use tox

Makes it more DRY and can see individual Travis jobs for each Python
version