Line numbers in Rouge

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<div class="highlight"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
3</pre></td><td class="code"><pre>def foo<span class="o">(</span>bar<span class="o">)</span>
  puts bar
end<span class="w">
</span></pre></td></tr></tbody></table>
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gistfile2.html

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<pre><code>def foo<span class="o">(</span>bar<span class="o">)</span>
  puts bar
end</code></pre>

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    counter-increment: line_numbers;
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<pre><code><span class="line">def foo<span class="o">(</span>bar<span class="o">)</span></span>
<span class="line">  puts bar</span>
<span class="line">end</span></code></pre>

gistfile4.html

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<table class="highlight">
  <tr><th>1</th><td>def foo<span class="o">(</span>bar<span class="o">)</span></td></tr>
  <tr><th>2</th><td>  puts bar</td></tr>
  <tr><th>3</th><td>end</td></tr>
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