Add model objects.
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/scala/com/qoid/bennu/model/Alias.scala
	src/main/scala/com/qoid/bennu/model/Connection.scala
	src/main/scala/com/qoid/bennu/model/Content.scala
	src/main/scala/com/qoid/bennu/model/LabelACL.scala
	src/main/scala/com/qoid/bennu/model/LabelChild.scala
	src/main/scala/com/qoid/bennu/model/LabeledContent.scala
Add model objects.