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This is a candidate fix for #56.
If ruby 1.9.3 is detected, it will force the usage to 0.11.30.pre15 or later. I admit it isn't a perfect solution for those who would like only "stable" gems but I think that, pragmatically, it's an okay fix considering that:
Also, on a side note, I was tempted to move the dependency selection block in the begin block so that this whole if block doesn't get executed at all if the current ruby gem dependency requirements are met, but I stopped there, aiming for a minimal fix to facilitate a quick review...