Add explicit failure when read_x() functions not completely handled (#148)
Add explicit failure when read_x() functions not completely handled (#148)

* Inability to read complete contends for read_X is a failure 
openwdl/wdl,broadinstitute/wdl,broadinstitute/wdl,openwdl/wdl,broadinstitute/wdl,openwdl/wdl,broadinstitute/wdl,openwdl/wdl