fully make bs4 and soupsieve standalone in the project

lib/bs4/element.py

@@ -9,14 +9,14 @@ import re
 import sys
 import warnings
 try:
-    import soupsieve
+    from ..soupsieve import *
 except ImportError as e:
     soupsieve = None
     warnings.warn(
         'The soupsieve package is not installed. CSS selectors cannot be used.'
     )
 
-from bs4.formatter import (
+from ..bs4.formatter import (
     Formatter,
     HTMLFormatter,
     XMLFormatter,
@@ -380,7 +380,7 @@ class PageElement(object):
             and not isinstance(new_child, NavigableString)):
             new_child = NavigableString(new_child)
 
-        from bs4 import BeautifulSoup
+        from ..bs4 import BeautifulSoup
         if isinstance(new_child, BeautifulSoup):
             # We don't want to end up with a situation where one BeautifulSoup
             # object contains another. Insert the children one at a time.