ClosureExpressionVisitor not using public method matching field name

[rikbruil]

I've run into a situation where I'm using ArrayCollection to filter some objects using Criteria::orderBy().

Assume these objects have a private property 'foo', and a public method 'foo()' which returns the private property value. The ClosureExpressionVisitor will check for various public methods existence (for example is*/get* variants, or access through magic methods like __get/__call).

I have the feeling there is one more check missing here, which is checking if a public method exists that matches the field name literally (without prepending get/is or through magic methods).

I'm not sure if this was omitted with a reason, maybe this means we are using a convention thats not very widespread? I will create a PR to hopefully communicate my issue better.

[malarzm]

Relates to #149