DATAJPA-461 - Regression in parameter binding.

Enhanced binding of parameters in StringQueryParameterBinder to be able to deal with situations where a parameter value has to be converted to be correctly bound e.g. for parameter values in IN-expressions.
We now only convert array values to collections if the value is to be bound in the context of an IN-parameter. Previously we erroneously always converted an array value to a collection value which lead to problems if an array value was meant to be used "as-is" e.g. in cases where an user wants to query for a certain byte[].

Original pull request: #56