IAttachmentResource is now implemented as a subresource to IRealEstateResource. This makes the api more natural
Removed commented code
The new method CreateAsync() takes a Stream instance as a parameter. So the API is not restricted on a file system for uploading attachments to IS24.
Added simple tests for ImportExportClient and introduced IResource interface which holds the IIS24Connection
Added new resource for managing the order of uploaded attachments. This resource hasn't been tested yet.
Forgot the ParameterType.UrlSegment on AttachmentsOrder resource
Merge pull request #4 from m4cx/develop

Enhencements and Refactoring