DavyJonesLocker / client_side_validations / 530

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Make conditionals more inline with guides

The Ruby on Rails guide contains the following example

```
  class Computer < ApplicationRecord
    validates :mouse, presence: true,
                      if: ["market.retail?", :desktop?],
                      unless: Proc.new { |c| c.trackpad.present? }
  end
```

Arrays and Strings were not supported before. https://github.com/rails/rails/blob/38fe5ae24/activesupport/lib/active_support/callbacks.rb#L429-L458
was used for inspiration.

Initially I handled a Symbol case, and raised an error if something
unexpected is passed, but that creates more than 100 lines in the
module, and rubocop complains. So I kept the code sending a message if
something other than a Proc or a String is passed.

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