Add links to wiki home and the new janus mailinglist
BACKLOG-1091 - Allow Metadata URL when creating a new entity
Added the saving of the actual metadataurl used
Implemented BACKLOG-682 Providing revision notes must be made mandatory before a change can be made in SR
Added a configuration key revision.notes.required  in /etc/surfconext/serviceregistry.module_janus.php to steer wether revision notes are optional or not
Added local DS_Store mac file to gitignore
Implemented BACKLOG-749 see the data the ARP was implemented in the arp overview screen
Created release notes for 1.15.0
merged develop into master