Go for 100% code coverage

[boardfish]

Each model needs to be tested. Off the top of my head, we'd better check for things like releases only being created if they have a game and a platform, duplication, and other things.

[boardfish]

Current state: factory_bot is configured and ready to go. Branch for this is 16-create-test-suite-for-models. When running rspec at present, a lot of tests are skipped as they're not configured properly, and others fail due to changes I've made outside the standard scaffold mould. Next step for this issue will be to fix the existing tests.

[boardfish]

Current state: Everything's either pending or passing. In the coming weeks, I'll go for 100% code coverage as recorded by the coverage reports generated by SimpleCov.

[boardfish]

Haven't checked this in a long while. I'll look into it soon enough.