title: html parsing with lxml when there's no root tag
body: <p>I've been building a scaffolding library for sqlalchemy using lxml and formalchemy, and I'm having a hard time getting them to play nicely.  specifically, <code>formalchemy.FieldSet.render()</code> returns a fragment of html with no root tag, and I cannot seem to figure out how to get lxml to parse it into something that can be included into an element tree:</p>
  
  <p>what I get:</p>
  
  <pre><code>&gt;&gt;&gt; lxml.etree.fromstring(formalchemy.FieldSet(toyschema.User(), session).render())
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "lxml.etree.pyx", line 2743, in lxml.etree.fromstring (src/lxml/lxml.etree.c:52665)
    File "parser.pxi", line 1573, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:79932)
    File "parser.pxi", line 1445, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:78709)
    File "parser.pxi", line 920, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:75083)
    File "parser.pxi", line 564, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:71739)
    File "parser.pxi", line 645, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:72614)
    File "parser.pxi", line 585, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:71955)
  lxml.etree.XMLSyntaxError: Extra content at the end of the document, line 8, column 1
  </code></pre>
  
  <p>what I Want:</p>
  
  <pre><code>&gt;&gt;&gt; ?????(formalchemy.FieldSet(toyschema.User(), session).render())
  [&lt;Element div at 0x1e48e10&gt;, &lt;Element script at 0x1e48cd0&gt;, &lt;Element div at 0x1e48730&gt;, &lt;Element div at 0x1ea1e60&gt;]
  </code></pre>
  
  <p>My Crude work-around:</p>
  
  <pre><code>&gt;&gt;&gt; lxml.etree.fromstring('&lt;root&gt;%s&lt;/root&gt;' % formalchemy.FieldSet(toyschema.User(), session).render()).getchildren()
  [&lt;Element div at 0x1e48e10&gt;, &lt;Element script at 0x1e48cd0&gt;, &lt;Element div at 0x1e48730&gt;, &lt;Element div at 0x1ea1e60&gt;]
  </code></pre>