After the feedback week 4

I have corrected most of issues right after the class. There are a few issues left:

1.Theme of the book(I should have think about it long before)

It is relative to the anatomy section in my book. The text of "ladder logic"should be replaced by something more meaningful.

2.I should do some research about Caption. It isn't right now. 

5.I should also unify the flow line of the book.

6.Finish the running head or find another way to classify the fonts about serif and san.

7.Finish the Pi font and display font pages

3.Adding describing text on the anatomy part.

4.Adding capital letters on the examples.