Set BASE_URL to Sinatra Scrum Primer app in this repository, instead of ScrumPrimer.org

We had to disable tests for Anime, About, and Contact sections as these do not
exist yet.
Daemonize Rack so we do not block when we run this in Travis

No idea if this works.  But we need to somehow return control back to the
console after starting up Rack as we need to run our RF tests.
Merge branch 'master' of https://github.com/basvodde/scrumprimer