Add support for encrypted Ecto String and Integer Array types

[boydm]

Had a need to encrypt an array of strings (a supported Ecto type) in the db. Example use case is a list of permissions in a record. This used to work in Cloak version 0.3 by using the EncryptedMapField because it was simply running the data through Json without actually casting into Ecto. Newer versions cloak do more type checking, so the Ecto type {:array, :string} fails now.

This PR creates two new encrypted field types corresponding to the Ecto types of {:array, :string} and {:array, :integer}. They are simple variations of the existing Map type. Docs and tests for both have been added/updated.

Now formatted...

[danielberkompas]

@boydm Thanks! My notifications on this repo were messed up, so I only just saw this. Sorry for the delay.

[danielberkompas]

I released a new version with these changes: 0.6.0. Because Elixir doesn't have arrays, I chose to rename the types to IntegerListField and StringListField respectively.

[boydm]

Thanks!

Those field names are fine. The only reason I went with array in the name is because that is what it is called on the database side. It's one of those cases where it isn't obvious if it should have database-style naming or elixir-style naming. Lives in between the two.

I think you made the right choice.

And thank you for the library!

--Boyd