Added test of getSize in PileTest
Added test of getCards in PileTest
Added cloning of lists where applicable
Added test of shuffle in PileTest
Added empty tests for searchpop and the list constructor in PileTest
Removed test for listconstructor as one already existed. My bad...
Added tests for pop in PileTest
Fixed a bug in the pop(String s) method where the wrong card was returned
Added test for pop(String s) in PileTest, refined test of pop() and reformatted some code for increased readability
Added test for add() in PileTest