RE: Issue #117

[jbarsoo]

Re: Issue #117; working example featuring ndb.StructuredProperty, ndb.LocalStructuredProperty, @EndpointsAliasProperty, and property-attribute validator=.

Also include GAE currently required app.yaml & appengine_config.py entries.

cc/ @dhermes

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[jbarsoo]

Per Google's insistence, I have signed something.

[googlebot]

CLAs look good, thanks!