Chapter 2: Getting Started

@laurocaetano, @rmascarenhas, @andrielfn and @rcillo After a lot of effort on this chapter I tried my best to solve exercises and problems, but couldn't finish all of them.
neither do I, this idea is based on pure feeling. My plan was to write the whole pseudo code of MERGE like you did, but since it was huge, I gave up... I'll try to elaborate it more