Added message Entities to hold all possible entities Maluuba can output currently
Some entities need some additional processing. Made that for contacts
Put all of entity2category into the definition of the msg itself.
Made a *hardcoded* mapping from entity-type to encoding in a message. Its not flexible to new messages at all. Also, times etc can't be parsed, as the concept of time between maluuba en ROS are different.
Actually added messages that contain Entities and TimeRange. TimeRange is currently represented as two strings, as is any time-related value.