added ability to have multiple recipients in the email
updated all tests to work with multiple recipients
added method for creating emails with multiple recipients
admin uses the create_email method
tested multiple recipients and added logic for handling no recipients
updated the docs to reflect the new recipients field
Merge branch 'develop' of github.com:ambitioninc/django-entity-emailer into feature/multi-recipients
Merge pull request #20 from wesleykendall/feature/multi-recipients

Multiple recipients in an email