It is an error to not set a tenant.
Ensure that we always have one root instance.
Implement documentation using YARD.
Ignore YARD temporaries and generated files.
Move YARD to the `test` group so that production installs do not need them.
Change the test suite from MiniTest to RSpec.
Simplecov for code coverage.
Load all seeds when the tests are run.
First spec for the Instance model.
Factory Girl for factories over fixtures.