Focus on what not how #4
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This is an attempt to focus on the what rather than the how, as discussed in Nathan's pull request. I agree with Tom that discussion of var does not belong in the doc, so I've omitted it.
I've added "composition over inheritance" as a "consider".
The comment on static types has been generalised to "avoid global state - examine all use of static types".
I've also added a bunch of other guidelines in an attempt to flesh things out.
Thoughts? Fire away!