fully make bs4 and soupsieve standalone in the project

lib/bs4/tests/test_tree.py

@@ -14,12 +14,12 @@ import copy
 import pickle
 import re
 import warnings
-from bs4 import BeautifulSoup
-from bs4.builder import (
+from ...bs4 import BeautifulSoup
+from ...bs4.builder import (
     builder_registry,
     HTMLParserTreeBuilder,
 )
-from bs4.element import (
+from ...bs4.element import (
     PY3K,
     CData,
     Comment,
@@ -33,11 +33,11 @@ from bs4.element import (
     Tag,
     TemplateString,
 )
-from bs4.testing import (
+from ...bs4.testing import (
     SoupTest,
     skipIf,
 )
-from soupsieve import SelectorSyntaxError
+from ...soupsieve import SelectorSyntaxError
 
 XML_BUILDER_PRESENT = (builder_registry.lookup("xml") is not None)
 LXML_PRESENT = (builder_registry.lookup("lxml") is not None)