Week 4 

I didn't have much time to work on the project since I was something like on vacation, but I started the documentation of the code using Doxygen to build html documentation of it.
Also, I added description / information about the edit distance algorithm.
I also started studying the Suffix tree and also how to build it linear time. The standard O(n^2) seems quite easy, but I plan to implement the better solution (Ukkonen).