Clean up README and TODO comments. #1592
Merged
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Updated the example in the README to one that uses the new style. I also took the opportunity to find a more interesting example and generally rewrote things based on how the formatter is used today.
When we were in the middle of the rewrite, I used "TODO(tall)" and "TODO(perf)" comments to track things I wanted to look into before I considered the rewrite "done". Now that the rewrite is basically good enough, I went through those. If I think the TODO is no longer worth doing at all, I just deleted it. Otherwise, I turned it into a general "TODO(rnystrom)" for us to keep in mind at some unspecified time.