Fix for #157

The pg array type is now detected.

This is how the annotation will look like:

    # == Schema Information
    #
    # Table name: equipment
    #
    #  id                 :integer          not null, primary key
    #  shop               :string(255)
    #  name               :string(255)
    #  category           :string(255)
    #  link               :string(255)
    #  image              :string(255)
    #  product_key        :string(255)
    #  brand              :string(255)
    #  created_at         :datetime
    #  updated_at         :datetime
    #  equipment          :string(255)
    #  gender             :string(255)
    #  sport              :string(255)      is an Array
    #  asin               :string(255)
    #  user_id            :integer
    #  rotation           :boolean          default(FALSE)
    #  colors             :string(255)      is an Array
    #  sizes              :string(255)      is an Array
    #  amazon_checked_at  :datetime
    #  models             :string(255)      is an Array
    #  year               :string(255)
    #  product_attributes :string(255)      is an Array
    #  color              :string(255)      is an Array
    #