Add enum34 as a dependency when python is less than 3.4
Merge pull request #23 from py3minepi/conditional-enum-install

Add enum34 as a dependency when python is less than 3.4
Fixed coverage dependency for coveralls
Merge pull request #34 from py3minepi/coveralls

Fixed coverage dependency for coveralls
Do not allow cov failures
coveralls uses git

https://travis-ci.org/py3minepi/py3minepi/jobs/36818049#L1505
Merge pull request #36 from py3minepi/feature/coveralls-fixes

Make coveralls pass
Added contributing policy

Fixes #14.