favlinks#index 뷰 템플릿에 pageless 기능 추가함.

jquery.pagelss.js를 이용하여 favlinks#index 뷰 템플릿에 bottomless pagination 기능을 구현함. 

``` ruby
gem 'will_paginate'
gem 'pageless-rails', github: 'rorlab/pageless-rails'
```

in application_helper.rb
``` ruby
  def pageless(total_pages, url=nil, container=nil)
    opts = {
        :totalPages => total_pages,
        :url        => url,
        :loaderMsg  => 'Loading more pages...',
        :loaderImage => image_path('load.gif')
    }

    container && opts[:container] ||= container

    javascript_tag("$('#{container}').pageless(#{opts.to_json});")
  end
```

in favlinks_controller.rb
``` ruby
  def index
    @favlinks = @bundlelink ? @bundlelink.favlinks : (params[:whose] ? Favlink.whose(current_user) : Favlink.shared)
    @favlinks = @favlinks.paginate(page: params[:page], per_page: 3)
    if request.xhr?
      sleep(3)
      render :partial => @favlinks
    end
  end
```

in views/favlinks/index.html.erb
``` erb
<h2>
  <%= params[:whose] ? "My Favlinks" : "All Favlinks" %>
  <small>
    <%= "of #{@bundlelink.title}" if params[:bundlelink_id] %>
    (<%= @favlinks.total_entries %>)
    <%= link_to icon('remove-circle'), favlinks_path if params[:bundlelink_id] %>
  </small>
</h2>

<div id='favlinks'>
  <%= render @favlinks %>
</div>

<div id="last_page"></div>
<%= will_paginate @favlinks %>
<%= pageless(@favlinks.total_pages, favlinks_path, '#favlinks') %>
```