Not sure why the removed requirements were added after freeze, but at least one seems to be the cause of a Travis issue.
Was unaware Cookiecutter would create a module with hyphens in its name. Had to fix the references to that. NOTE TO SELF: watch out for hyphens when using Cookiecutter.
Apparently package names with hyphens are a problem. Switching to underscores where necessary.
Merge branch 'travis_integration' into develop.

The branch was used to make sure the project was configured so that
it could be tested using Travis CI. Now that it is, this state of
affairs should be maintained.