suppress those goddamn INFO logs from pdfbox #killthemwithfire

JRuby is the work of the devil.

JRuby is the spawn of Satan.

But through liberal application of holy water, fire, garlic, a silver bullet and Googling that which should never be Googled, I managed to figure out how to suppress those damn INFO logs that PDFBox keeps emitting. I don't know if there is a better way (other than implementing log4j, which seems a bit heavy) -- or if those INFO logs are useful to you, Manuel, and ought to be able to be turned on/off somewhere. But this does it.

I've seen things that no org.java.mortal ought to see.