testing for and fixing issue with infinite recursion
adding Doctrine Cache wrapper classes, and expanding SquirtUtil
adding FileCache Doctrine Cache's and using a trait to be DRY
using more code-reuse in ArrayCache squirt wrapper class
creating a Squirt wrapper for PDO, and fixing and enhancing SquirtUtil
building out unit tests for SquirtUtil class
implementing simple unit tests for Doctrine Cache wrappers
tweaking the README to provide more clarity
expanding a note