Adjusting ds_row->find to use ds_row->raw when necessary
Now allowing ds_result->rows to take a member stream
Removed code repetition.
Missed targeting self for ds_result->rows(::tag) also changed boolean param

The ds_result->rows(::tag) method was calling the lasso rows method instead of
the ds_result->rows(::memberstream) method. (Sometimes syntax highlighting can
be deceiving. Also should have tested both use cases)

Ke dosn't like named-parameter booleans, so preemptively made useOnCreate just
an optional parameter.
Merge pull request #3 from bfad/master

Merging with errors, will post correct.