Update Guardfile so that guard is actually working properly and running the spork server,
add some options to the spec_helper file that enable specifying specs that have focus at the
moment, add a micropost model and associate it with the user model, add integration tests for
the micropost model and a few others to the user model to test the association between them,
add a factory for microposts that can be used to generate test objects that belong to the test
users that are generated by the user factory, migrate the changes so that the development database
is up to date - App is halfway through section 10.1.4 (Micropost refinements), and is ready to begin
the segment of that section entitled 'Default scope'.