SEOize any url

gistfile1.builder

def slug
  slug = title.downcase.gsub(/'s/, '').gsub(/[^[:alnum:]\-\s\_]/, '').split(/[\s\-\_]+/).delete_if { |i| i.empty? }
  limit_reached = false

  # This ensures only whole words are used
  slug = slug.inject('') do |str, token|
    new_token = str.length == 0 ? token : "-#{token}"
    limit_reached = true if (str.length + new_token.length) > 50
    limit_reached ? str : str << new_token
  end
end