DATAJPA-476 - Mitigate spec violations in Hibernate for query creation.

Hibernate invalidly returns null for getModel() on its PluralAttribute implementation which causes the necessity for joins not having been detected previously.

We now fall back to joining in case we don't find a Model and deal with a PluralAttribute.
DATAJPA-483 - Fixed parameter binding detection with parentheses.

When a parameter was listed with parentheses we didn't detect a custom binding and fell back to the standard binding. This effectively disabled the array-to-collection binding which is currently necessary for in bindings as some persistence providers do not bind arrays to in-clauses correctly.

Tweaked the regular expression to detect the bindings to accept the optional parentheses.