Merge pull request #1 from terrycojones/fix-typos

Fixed some typos and wording, etc.
Added pass to classes with no bodies

Just to help readability, it makes it explicit that the intent is that the class has no body (rather than there's missing code).
Merge pull request #2 from ntoll/master

Added pass to classes with missing bodies.
Small typo fix in the readme
Merge branch 'master' of github.com:ceronman/typeannotations
Turn into a package.
Convert README to reStructured text.

The Cheeseshop cannot understand markdown, To make the
description look pretty, we must convert to reStructured text.
Add version.