Swagger backend now separates multiple dynamic type instances

[hindsholm]

This is a fix for issue #147 .
The fix contains code to generate separate dynamic Json types in the swagger backend so that e.g. responses generated with the javax.json builders will give correct results.
There is also a test for the issue.
Some other tests needed small changes because they actually relied on the erratic behavior.
I also had to introduce a resetDynamicCounter() method in the TypeIdentifier class in order to test because it uses a static variable for counting which is not otherwise accessible.

[sdaschner]

Thanks for contributing and thanks a lot for adding tests, so many times they are neglected :-)

I saw the reset method. I added it into a test scope functionality that resets it via reflection. Not the nicest code, but I personally prefer this over adding functionality to production code.