Version: 0.11.1 [2014-09-10]
o ROBUSTNESS:  Added package system tests for memoizeCall()
  and addMemoization().
o DOCUMENTATION: Clarified in help that function calls that
  returns ("has value") NULL will not be cached.
o BUG FIX: addMemoization() will no longer memoize an already
  memoized function.