Added support for <jsp:include tag

I've added support for <jsp:include tag in my own fork of jsptest: this extension resumes what I've provided as "patch" for a feature request added to the old jsptest's repository on sourceforge: http://sourceforge.net/p/jsptest/feature-requests/5/ .
I'm evaluating techniques and libraries for JSP unit testing and jsptest is certainly the best option I've found: the lack of <jsp:include support is however an obstacle to jsptest adoption for existing projects... so I would be very glad if my extension was included in the main development stream!
Thank you very much!

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