Move from bs4 to etree

BeautifulSoup when using lxml in XML mode would mis-parse XML with very
long attributes. Specifically, a <polygon> with about 18MB in its points
attr would make lxml not return anything past that point in the file.

bs4 uses lxml, which uses libxml2. libxml2 has a config option for
parsing "huge" files that increases buffer sizes and avoids this error,
and this option is exposed in lxml, but AFAICT you can't tell bs4 to set
it, and bs4 just silently swallows the error from lxml.

Fixes one half of #46

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