Render HalResource in collections correctly.

Fixes #70.

Signed-off-by: Michael Gooden <michael@bluepointweb.com>
Merge pull request #71 from MichaelGooden/hotfix/70

Render HalResource in collections correctly.
[#71] Added test

- Passes even without changes introduced by PR.
Merge branch 'master' into hotfix/71
[#71] Proper fix

- If an individual resource in a collection is a HalResource, we should
  render it directly. This ensures all links attached to it are rendered.
Merge branch 'hotfix/71'

Close #71