Traceback (most recent call last):
  File "run_urltests.py", line 28, in <module>
    random=arguments['--random']
  File "/Users/julielavoie/work/sawhorse/bylines/tests/performance.py", line 23, in wrapper
    fn(*args, **kwargs)
  File "/Users/julielavoie/work/sawhorse/bylines/tests/performance.py", line 193, in test_extractor_performance_on_html
    'extracted': call_extractor_on_file(extractor, url)
  File "/Users/julielavoie/work/sawhorse/bylines/tests/performance.py", line 174, in call_extractor_on_file
    result = extractor(filename)
  File "/Users/julielavoie/work/sawhorse/bylines/bylines/extractor.py", line 98, in find_authors_from_file
    authors = find_authors_from_html(content)
  File "/Users/julielavoie/work/sawhorse/bylines/bylines/extractor.py", line 131, in find_authors_from_html
    authors = find_authors_from_lxml_tree(lxml.html.fromstring(html))
  File "/Users/julielavoie/work/sawhorse/bylines/bylines/extractor.py", line 259, in find_authors_from_lxml_tree
    element = drop_tags(element, DROP_TAGS)
  File "/Users/julielavoie/work/sawhorse/bylines/bylines/extractor.py", line 246, in drop_tags
    tag.drop_tree()
  File "/Library/Python/2.7/site-packages/lxml/html/__init__.py", line 199, in drop_tree
    if self.tail:
  File "lxml.etree.pyx", line 931, in lxml.etree._Element.tail.__get__ (src/lxml/lxml.etree.c:41551)
  File "apihelpers.pxi", line 620, in lxml.etree._collectText (src/lxml/lxml.etree.c:18637)
  File "apihelpers.pxi", line 1322, in lxml.etree.funicode (src/lxml/lxml.etree.c:24615)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x92 in position 33: invalid start byte