Adds Exceptions to be used in IModelProvider classes

Adds ProviderException
Adds ResourceNotFoundException
Adds MalformedRequestException
Adds ResourceAlreadyExistsException

Change-Id: I1412914b9fc10519c12077fc7735d87ab03ea7f5
Signed-off-by: Maximilian Conradi <maximilian.conradi@iese.fraunhofer.de>
5 files changed