Remove commented code and TODO comments

[calebeby]

There are some TODO comments that are more helpful, but they should probably be moved to GitHub Issues.

      // @TODO move these into fixtures?

 * @TODO is `extendedData` used by any callers?

Also there is commented code that should be removed

// Var config = require('./config');

And then there are these TODO comments 😭

import { deepObj, resourceKey, resourceId } from './object'; // TODO NO NO NO NO

    if (!fieldData.hasOwnProperty('contents')) {
      // TODO again
    }

import { deepCollection } from './object'; // TODO NOPE

All of these comments should be removed, and some of them should be moved into GitHub Issues.