Move s3 concepts dir into examples directory

There was already a test for this, but we run our tests
against a git checkout of the repo.  However, docs/ is
not part of the sdist which explains why it could pass our
tests but fail to show up when people pip install'd the cli.

Fixes #280.
Merge branch 's3-tutorial-move' into develop

* s3-tutorial-move:
  Move s3 concepts dir into examples directory