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.
DATAJPA-461 - Polishing of binding implementation for StringQueries.

We now always create a ParameterBinding for all parameters to simplify the client code so that it can safely always lookup bindings and apply them.

Changed the setup of the regular expression to work with the keywords provided by the binding types to ease future extensions.

Added integration test to quickly verify the EclipseLink bug we're running into now for further reference.