test_bs4_version_fails: ImportError: html5lib not found please install it
```
======================================================================
ERROR: pandas.io.tests.test_html.test_bs4_version_fails
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python3/dist-packages/pandas/io/tests/test_html.py", line 83, in test_bs4_version_fails
    flavor='bs4')
  File "/usr/lib/python3.2/unittest/case.py", line 557, in assertRaises
    callableObj(*args, **kwargs)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python3/dist-packages/pandas/io/html.py", line 906, in read_html
    attrs)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python3/dist-packages/pandas/io/html.py", line 765, in _parse
    parser = _parser_dispatch(flav)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python3/dist-packages/pandas/io/html.py", line 719, in _parser_dispatch
    raise ImportError("html5lib not found please install it")
ImportError: html5lib not found please install it
```

on 4c2d050

there is no python3-html5lib on any debian system yet
