Contacts API Improvements

[tneotia]

Creation

• Add ability to explicitly set either the database ID or some sort of guid field in case clients want to use that as an identifier. Use case: I store my company's contacts in my own cloud database, identified with a UUID. When the contact name/number changes, I want to be able to update this in the server contacts list and setting the database ID or having my own guid field in the server contacts list allows me to calculate the diff.

Update

• Create a method to allow updating data for an individual contact (or many contacts) based on either the database ID or the guid field, whichever is provided
• Updating should be more granular/specific, as currently updating a contact's phone number results in another potential address added to the contacts database rather than overwriting the old one

Delete

• Create a method to allow deleting an individual contact (or many contacts) based on either the database ID or the guid field, whichever is provided