Added ExcludionStrategy to use with MimeTypes
Refactored sendRequest-method to be a bit cleaner.
Added methods to handle reading stuff from errorstream and inputstream of a connection.
Removed unused ProblemData and ProblemDataSet. The right ones are RoutingProblemData and RoutingProblemDataSet.
Added MimeType and MimeVersion fields to classes that require them in the future.
Moved field
Removed ExclusionStrategy from API.
Update and Import requests now get their versions and types from their base types (data classes)
Removed unnessesary lines from a test.