Fix BeautifulSoup imports from future

lib/bs4/builder/_htmlparser.py

@@ -8,7 +8,7 @@ __all__ = [
     'HTMLParserTreeBuilder',
     ]
 
-from html.parser import HTMLParser
+from future.moves.html.parser import HTMLParser
 
 try:
     from html.parser import HTMLParseError

lib/bs4/dammit.py

@@ -10,7 +10,8 @@ XML or HTML to reflect a new encoding; that's the tree builder's job.
 __license__ = "MIT"
 
 import codecs
-from html.entities import codepoint2name
+from future.moves.html.entities import codepoint2name
+from future.builtins import chr
 import re
 import logging
 import string