Some minor updates to the CONTRIBUTING.md document

Added information about the GitHub workflow from http://scottchacon.com/2011/08/31/github-flow.html
first version of testing
Merge pull request #6 from jamiereid/master

Updates to the CONTRIBUTING.md document
Merge pull request #8 from brendam/master

first version of testing
Update README.md
add flake8 config file
Merge pull request #11 from brendam/master

add flake8 config file
fix pep8 errors
Merge pull request #12 from brendam/master

fix pep8 errors