added screed and read_parser streaming testing

Marked as known failing since they currently fail.
Will investigate.

Relevant to #393, #654
Ahh, I was guilty of incomplete grokking.  Please place a comment (docstring?) on the read_parser_streaming_function that this is test code, not support code, and describe what it does.

Also, would suggest changing name of read_pareser_stremaing_function to something like 'execute_streaming_read_test'.