Reorder 'Setting the Default Page' and Heroku deployment

Travis,

As discussed, below are the list of changes to the new PR.

1. Removed 'consider_deploying' from "Running Your Application Locally" and "Crud with Scaffolding".
2. Moved "Setting the Default Page" after "Crud with Scaffolding" (with routing discussion included).
3. Added 'consider_deploying' to the end of "Setting the Default Page".
4. Removed previous verbiage from PR #215 alerting to Heroku's 404 error.

I believe I had an issue with the previous PR so I have closed it and am resubmitting. Please let me know if there are any additional changes I may make.