Making it easier to include in the Gemfile

[mikaa123]

Now it's possible to use Mixology in the Gemfile with
gem 'mixology', :git => 'git repo url'

[mikaa123]

I also included two hooks: mixed_in and unmixed

Module A
  attr_accessor :name
end

Module B
  def self.mixed_in(obj)
    obj.mixin A
  end

  def self.unmixed(obj)
    obj.unmix A
  end
end