hasAlternatingParity

  Write a static method hasAlternatingParity that
   returns whether or not an array of integers has alternating parity (true if
   it does, false otherwise).  The parity of an integer is 0 for even numbers
   and 1 for odd numbers.  To have alternating parity, a list would have to
   alternate between even and odd numbers, as in the following list:

        (3, 2, 19, 8, 43, 64, 1, 0, 3)

   If an array called "data" had the values above stored in it, then the
   following call:

        hasAlternatingParity(data)

   would return true.  If instead the array stored the following values:

        (2, 13, 4, 1, 0, 9, 2, 7, 4, 12, 3, 2)

   then the call would return false because the list has two even numbers in a
   row (4 and 12).

   By definition, an empty list or a list of one element has alternating
   parity.  You may assume that the values in the array are greater than or
   equal to 0.

   Write your solution to hasAlternatingParity below.