Correct sort order by using list.sort with support for 'key' and 'reverse'....

Correct sort order by using list.sort with support for 'key' and 'reverse'. This method is less efficient, but allows the tests to pass.

pkg_resources.py

@@ -29,7 +29,6 @@ import token
 import symbol
 import operator
 import platform
-import bisect
 from pkgutil import get_importer
 
 try:
@@ -828,7 +827,8 @@ class Environment(object):
         if self.can_add(dist) and dist.has_version():
             dists = self._distmap.setdefault(dist.key, [])
             if dist not in dists:
-                bisect.insort(dists, dist)
+                dists.append(dist)
+                dists.sort(key=operator.attrgetter('hashcmp'), reverse=True)
 
     def best_match(self, req, working_set, installer=None):
         """Find distribution best matching `req` and usable on `working_set`