Added randomIndexIntoReturnRows function.

The randomIndexIntoReturnRows function generates a random index base on
the number of rows returned by the database view query.  This random
index is used to pick a random fortune from the fortunes that are
returned by the database.
Updated comments in getRandomFortune
Added console.log statement to observe behavior of randomIndexIntoReturnRows function.
Return statement.
Using randomIndexIntoFortuneRows
Curly brace