Catch more errors and better output in rql tests (#668, #724)
Allow tests to run in debug mode (#614)
Correctly test for server shotdown in polyglot tests
Fix defects from review 524
Extra tweaks to the driver tests to run on travis
Merge branch atnnn/614 into next

Closes #614

Closes #724

Review 524 and 573 by @wmrowan
Merge branch 'next' into sam_890