Issue 88: Support Multivalue Comparisons
Fix for SQLSTATE[42804]: Datatype mismatch: 7 ERROR:  argument of AND must be type boolean, not type text
Removed the test from unsupportedTests in ImplementationLoader

Signed-off-by: Willem-Jan Zijderveld <willemjan@beeldspraak.com>
Fixed some of the comments
Merge pull request #126 from wjzijderveld/88-multivalue-comparison

Fixes #88 multivalue comparison