title: wickedpdf not rendering images?
body: <p>i am using <code>wickedpdf</code> gem to generate <code>pdf</code> <code>invoice</code> from the <code>html</code> code.</p>
  
  <p>gems:</p>
  
  <pre><code>gem 'wicked_pdf'
  gem "wkhtmltopdf-binary"
  </code></pre>
  
  <p>gemfile.lock</p>
  
  <pre><code>wicked_pdf (1.0.6)
  wkhtmltopdf-binary (0.9.9.3)
  </code></pre>
  
  <p>in controller:</p>
  
  <pre><code>  def show_pdf_invoice
      respond_to do |format|
        format.html { render :layout =&gt; "pdf.pdf.erb" }
        format.pdf do
      render pdf: "show_pdf_invoice", :layout =&gt; 'pdf.pdf.erb'
      #render :pdf =&gt; "pdf"#, :layout =&gt; 'pdf.html.erb'
        end
      end
    end
  </code></pre>
  
  <p>in <code>views/invoices/show_pdf_invoice.pdf.erb</code></p>
  
  <pre><code>  &lt;img id="image" src="https://www.google.co.in/logos/doodles/2016/holidays-2016-day-2-6356741311692800-scta.png" alt="logo" /&gt; 
    &lt;%= wicked_pdf_image_tag 'https://www.google.co.in/logos/doodles/2016/holidays-2016-day-2-6356741311692800-scta.png' %&gt;
  </code></pre>
  
  <p><code>pdf</code> is getting generated. But the images are not showing. in the place of  images empty boxes are coming. unable to find the issue.</p>