Fix "include" examples to use Github-flavored code block

Previously, these lines were using '>' which is the Markdown syntax
for a "blockquote", but within this, the '#' in "#include" was still
interpreted as a header, (which was not desired), and throwing away
the rest of the line.

It seems that a "codeblock" is what is wanted here instead, (which
should result in un-interpreted text wrapped in <pre>). Markdown
expects 4-space indent for this.

See:

	https://help.github.com/articles/github-flavored-markdown
Convert list of items to an actual list

Otherwise, these were running together in a single line, making them
hard to read.
Rewrite a lot of the README.

The story about how we came to needing GetProcAddress functions isn't
that interesting, but the featureset is something that should be
(particularly when comparing to similar tools that exist).

Fixes #7
Use ``` on a bunch of code in the README.

Some of it is to be prettier, and some of it is to avoid misformatting
when using live preview at http://tmpvar.com/markdown.html