'simple start', a rake task to get up and running quickly

This creates files based on the .example files, creates a new secret in
the initializer, loads the schema, starts a server, and opens a browser.

I created a pull request since I'm not sure if this is something we want in master. I was just playing around with the idea of creating a rake task to shave off a few minutes from the initial setup of the app.  Step 1, clone the repo, step 2, rake simple_start.  My only concern is that running it a second time would wipe the DB (because it loads schema), however that could be also be beneficial if someone wants to "start over".

Thoughts?