When the resource is a zero result query,
i.e. post_comments = PostComment.where("1=0")
the json_key will become 'postcomments' rather than 'post_comments'.
Using 'underscore' instead of 'downcase' fixes the error.
Currently, 0.10.0.pre doesn't support `meta` option in `render`. This
way, there's no way to support features such as pagination. `0.9` had
this feature in place.
This adds support for it, as well as fixes small things in README.md.
This won't support `meta` in array responses because arrays don't have
keys, obviously. Also, the response should have a `root` key, otherwise
no `meta` will be included.
In some cases, for example using JsonApi, ArraySerializer will result in
a response with a `root`. In that case, `meta` will be included.
