Improve EagerFetching Related Data

[rotexdegba]

Look into allowing nested arrays for specifying related data to be eager loaded via fetch methods. Right now you can only specify a one level array of strings. Need to be able to do something like this:

E.g

fetchOneRecord(
   null,
  [
    'author',
    'summary',
    'replies' => [
        'author'
  ]
);