First draft of template engine chapter

I've added myself to the table of contributors, but I have a few questions about the information we're choosing to present.
We're holding all chapters to a standard in which we try to eliminate as many references as possible to things being "easy", "simple", "trivial", etc. We'd like to have the readers decide that for themselves, rather than potentially feeling silly if the text identifies something as "simple" that they are having trouble with :)