Minor corrections

Two updates in two days. Put in many minor corrections suggested by Yun Fu and Mikhail Sizintsev. The changes are all in chapters 5-8.

New update

New update last night - added the version 0.0 of a chapter on Bag of Words models and fixed a lot of mistakes since last time. I'm now working my way through the book adding in problems, applications and references. Yes. After 550 pages there are finally (some) references.

No longer ashamed

New update yesterday. I think we have reached the point, where I am no longer ashamed of any of the content in the book. Surely this is some kind of milestone! Almost finished the main content now - one more chapter to go. Since last time, I have re-written chapter 10 completely and also done some work on chapter 11, added some more algorithms to the back and and sorted out some mistakes in chapter 1-5.