def link_detail(slug)
      slug = slug.slug if slug.instance_of? Instamojo::Link
      get("links/#{slug}")
      @response.success? ? Instamojo::Link.new(@response.body[:link], self) : @response
    end
def link_detail(slug)
      slug = slug.slug if slug.instance_of? Instamojo::Link
      get("links/#{slug}")
      @response.success? ? Instamojo::Link.new(@response.body[:link], self) : @response
    end
GET /links/:slug