Refs #29 - Create EntityIterator class.
Refs #29 - Remove deprecated method.

Return entity iterator rather than array of entities.
Refs #29 - Set entities in setEntities().

Set default params as empty array in helper method.
Refs #29 - Clarify comment.
Merge pull request #29 from synapsestudios/feature/29-entity-iterator

Mappers Return EntityIterator