Fix typo in addRelationships documentation
Add assertion in `relatedTypes` to catch undefined relations
Add assertion on BasicAdapter.findHasMany
use correct adapter methods
extract validation errors with correct attribute names
Merge pull request #855 from tchak/adapter-methods

use correct adapter methods
Merge pull request #849 from MikeAski/improve-assertions

Add assertion on BasicAdapter.findHasMany
Merge pull request #831 from tchak/validation-errors-fix

Extract validation errors with correct attribute names
Merge pull request #824 from arbales/master

Add assertion in `relatedTypes` to catch undefined relations
Merge pull request #793 from JasonKriss/patch-1

Fix typo in addRelationships documentation