DB and JPA stuff for notifications.
Added some JAXB stuff for notifications.
Initial JPA<->JAXB mappings for notifications (using Orika).
Migrated record amend email to store notification using notifications
API.
Merge branch 'master' into notificationsApi

Conflicts:
	orcid-persistence/src/main/resources/db-master.xml
Added put code and source to notification schema.
First attempt at creating text digest email.
JAXB mapping improvements.
Added createdDate to notification JAXB.
Added method for find profiles that have notifications ready to send.
Merge branch 'master' into notificationsApi
Added stuff to look for unsent notifications and send digest via
MailGun.
Added option to enable notifications per user.
Also add amend email/notification when works/affiliations/fundings added
via API.
Started notifications page.
Added html body of notification to notifications page.
Corrected url to notification body html.
Activate notifications tab when on notifications page.
Show notifications tab when option is enabled.
Changed so that source is ORCID if no other source is explicity set.
Updated so that notifications are sent for first time.