[allura:tickets] #7952 Update beautifulsoup usage to v4

[Dave Brondsema <da...@brondsema.net>]

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** [tickets:#7952] Update beautifulsoup usage to v4**

**Status:** open
**Milestone:** unreleased
**Labels:** cleanup 
**Created:** Thu Aug 06, 2015 09:42 PM UTC by Dave Brondsema
**Last Updated:** Thu Aug 06, 2015 09:42 PM UTC
**Owner:** nobody


[#7947] introduced beautifulsoup4, which can be installed side-by-side with beautifulsoup.  We should migrate our existing usage of beatifulsoup 3 over to 4.  

http://www.crummy.com/software/BeautifulSoup/bs4/doc/#porting-code-to-bs4

Note that when I started using bs4 in [e0e2f0] I had to choose a parser to use.  I went with html5lib because it seemed to work better ('html.parser' had some strange `</li>` behavior in a test).  But html5lib spits out html/head/body tags so we'll have to strip those out again.


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