module Middleman::Features::ClassMethods

def activate(feature)

activate MyFeatureModule

Alternatively, you can pass in a Middleman feature module directly.

activate :lorem

feature module and includes it.
It takes a underscore-separated symbol, finds the appropriate
This method is available in the project's `config.rb`. 
def activate(feature)
  feature = feature.to_s if feature.is_a? Symbol
  if feature.is_a? String
    feature = feature.camelize
    feature = Middleman::Features.const_get(feature)
  end
  register feature
end

def enable(feature_name)

Deprecated API. Please use `activate` instead. 
def enable(feature_name)
  $stderr.puts "Warning: Feature activation has been renamed from enable to activate"
  activate(feature_name)
  super(feature_name)
end