Adding QuickSort.java

This was one of the ones Chris was going to do, but I had the time to work with it, so I did. I'm looking at Merge Sort as well.
Adding MergeSort.java

This one will definitely need some testing to make sure it works. I had to do some "fun" edits to the comparisons to make it require an int[] instead of a Comparable<Integer>[].
Merge pull request #9 from FaithForHumans/Searchanowski

Quick & Merge Sorts added