Added a invalidation check for the newRecipientTextView to prevent invalid inputs.
This checks for invalid numbers or contact names and when it loses focus if it doesn't
pass the check it will return focus to this component emptying the content.

ContactsUtil:
New Function isAValidPhoneNumber to check if string input is a valid input for a Contact.
Did a correction to regex check to allow for 1 to be added to a phone number.