Removed data classes from previous approach.
Mock for GetData working.  CsvViewerData object.
GetPage_FirstPage_ReturnsRowsForDefaultPageSize
Broken.  Strange behavior...count returning 3 when only 1 item in collection.
Revert "Can add multiple rows."

This reverts commit 1edd4a623745fe2810ebe606c09da42b08ca27d1.
Merge branch 'filesource-mock'