#450 use pydev-included jython as default jython interpreter

[Glyph Lefkowitz]

Given that Pydev already has a jython.jar packaged with it, I'd like to be able to use that as my jython interpreter and not install another one on every computer where I use it.

My main use for a jython interpreter is to associate it with the project I use to store my own Pydev scripts, so I'd like it to match anyway.

I can do this right now by manually selecting the jython.jar packaged along with pydev, but every time I update pydev it breaks.