Ensure we're always trying to iterate over a list
setup Travis CI to run test coverage

- Set the minimum test coverage number to 90%
- Get 100% test coverage on security groups and subnets
- Add more test coverage on networks
Merge pull request #162 from jmeridth/run_test_coverage_on_travis_ci

Setup Travis CI to run test coverage
Merge pull request #164 from Cerberus98/master

Ensure we're always trying to iterate over a list