Question methods for enum accessors

[rtalexk]

After using this gem for the last two years my team and I ended up adding a lot of methods to ask whether an object is a given record, ie:

class Country < ActiveHash::Base
  include ActiveHash::Enum
  self.data = [
      {:id => 1, :name => "US", :capital => "Washington, DC"},
      {:id => 2, :name => "Canada", :capital => "Ottawa"},
      {:id => 3, :name => "Mexico", :capital => "Mexico City"}
  ]
  enum_accessor :name

  # a method like this for each record
  def us?
    name == "US"
  end
end

Then, somewhere else:

# Assuming a user has an association to a Country
>> user.country.us?
=> true

This could be added programmatically using meta-programming, but I think it'd be a nice feature for the gem to do it either automatically by the enum_accessor or using a different macro for this purpose.

[rtalexk]

Nvm, I just saw this PR #321