Update email validation rules to disallow the percent character (e.g.
`foo%bar@gmail.com`) and names ending with a period (e.g. `foo.@gmail.com`).
Names ending with a period are invalid according to the RFCs and cause
`Mail::Address.new` to raise an exception.
The percent character is technically legal, but only one email used it
and it was probably a typo.
This directory contains library code used through Danbooru. This includes things like defining API clients, dealing with
sources, parsing tag searches, storing and resizing images, and so on.
Many of the files here use the Service Object pattern. Instead of putting complex code in models or controllers, it goes
here, in plain old Ruby objects (POROs). This keeps models and controllers simpler, and keeps domain logic isolated and
independent from the database and the HTTP request cycle.
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