Add unit tests for logOn and logOnResponse classes
Add unit tests for logOffResponse class
Add unit tests for label and audio classes
Bugfix validation of label and audio objects
Add unit tests for serviceAttributes and sub classes
Add unit tests for getServiceAttributesResponse class
Add unit tests for readingSystemAttributes and sub classes
Bugfix validation of additionalTransferProtocols object
Add unit tests for setReadingSystemAttributes and setReadingSystemAttributesResponse classes
Add unit tests for getContentList and getContentListResponse classes
Bugfix validation of contentList and getContentList objects
Add unit tests for getContentMetadata and getContentMetadataResponse classes
Add unit tests for issueContent and issueContentResponse classes
Add unit tests for getContentResources and getContentResourcesResponse classes
Add unit tests for returnContent and returnContentResponse clasess
Bugfix building contentList

Attributes firstItem and lastItem are optional in a contentList. In cases
where contentList is empty, it's not necessary to set values for
firstItem and lastItem.
Bugfix creation of resource

A resource may contain an optional lastModifiedDate attribute.
Add path to data types to include path
Allow specification of which ini file to parse in DaisyOnlineService

This option allows easier unit testing of the DaisyOnlineService class.
Allow disable of internal session handling

This option allows easier unit testing of the DaisyOnlineService class
and shall only be used when debugging or testing.