Establish relationship between phone and contact model.
Add feature that prevents secondary email being the same as email for contacts.
Add feature that prevents secondary email being longer than 50 characters and having a correct format.
Add feature that prevents contact notes being longer than 600 characters.
Provide input for 'Secondary Email' in 'New Contact' form.
Refactor contacts_spec.
Provide input for 'Notes' in 'New Contact' form.
Provide functionality that prevents a contact having the same phone number.
Provide functionality that allows different contacts to share the same phone.