removed .metadata from repo

metadata still hopefully exists, but is no longer saved in the repo
Accomplished several tasks

Started adding Effects
Converted MlList's head and tail back to methods
Gave MlList the withWeight() method
Initial Addition of Effects
non-tasked items:
Created Roll
Switched Interfaces to simple names with Implementations starting with a
'U'
created rollers package - empty
fixed and cleaned IterableUtil a little
cleaned Weighted<> - also gave equals() and hashCode()
removed HashTester - will eventually be properly created as a JUnit test
made some small changes to Face, Die, and DiceSet interfaces (and
implementations)