Clarified documentation of OplogEntry.
Changed 2012 to 2013 and added parameter for BasicOperationSubscription
OplogEntry now returns DBObjects for the update query and criteria
fields.
Changed hardcoded "op" field to the corresponding constant in OplogEntry.
Changed created date.
Added class for subscribing to updates to a specified field.
Merge branch 'BlackboardClientDev' of https://github.com/hesselmeulenbeld/HUniversal-Production-Utrecht into development