Frege/frege — pull request #94 by mmhelloworld (2014-12-01 05:13:53+00:00)
Title: Port java.util package

1. Added more classes/interfaces from `java.util` package as listed [here](https://docs.oracle.com/javase/7/docs/api/java/util/package-summary.html).
2. Updated `frege/java/Lang.fr` to support the necessary classes.

@Ingo60 Please review.