Documentation!

[cansavvy]

There's a few forms of docs we need here:

1. The @returns are pretty vague at this point. They could use some boosting and better descriptions.
2. We need tutorials for each app -- and we need to think about the organization of this.

Notes about approaches:

• We want to be specific enough about the data to be helpful but not so specific that when the API changes that we are left with a lot of maintenance work.
• We'll need screenshots to show people how to set up credentials.
• Note about the flexible prescriptivity. -- You can use metricminer as is or you can use the dataformat = "raw" or not use the dashboard template and do your own thing.