show() for PostConditions

Summary: It's handy to print arbitrary sets of PostConditions while debugging.

Reviewed By: @ottoni

Differential Revision: D1388272
Re-record stable frameworks, add to FB CI

Summary: allthetests

This is all the stable frameworks except for monolog and vfsstream, which have a different pass rate on an FB build to the OSS build.

Notably, Joomla and Klein are not at 100%.

Reviewed By: @JoelMarcey

Differential Revision: D1387769
Fix mysqli_query return value for query without result

Summary: Closes #2965

Reviewed By: @JoelMarcey

Differential Revision: D1387738

Pulled By: @sgolemon