isAllEven

  Write a static method isAllEven that takes an array of
   integers as a parameter and that returns a boolean value indicating whether
   or not all of the values are even numbers (true for yes, false for no).  For
   example, if a variable called list stores the following values:

        (18, 0, 4, 204, 8, 4, 2, 18, 206, 1492, 42)

   Then the call:

        isAllEven(list)

   should return true because each of these integers is an even number.  If
   instead the list had stored these values:

        (2, 4, 6, 8, 10, 208, 16, 7, 92, 14)

   Then the call should return false because, although most of these values are
   even, the value 7 is an odd number.

   Write your solution to isAllEven below.