Revert "Fix sys.path manipulation in pavement.py, with detailed comment"

This reverts commit 544616be4b.

common/djangoapps/edxmako/management/commands/preprocess_assets.py

@@ -2,7 +2,7 @@
 Preprocess templatized asset files, enabling asset authors to use
 Python/Django inside of Sass and CoffeeScript. This preprocessing
 will happen before the invocation of the asset compiler (currently
-handled by the assets paver file).
+handled by the asset Rakefile).
 
 For this to work, assets need to be named with the appropriate
 template extension (e.g., .mako for Mako templates). Currently Mako

common/djangoapps/student/management/commands/anonymized_id_mapping.py

@@ -19,7 +19,6 @@ from student.models import anonymous_id_for_user
 class Command(BaseCommand):
     """Add our handler to the space where django-admin looks up commands."""
 
-    # TODO: revisit now that rake has been deprecated
     # It appears that with the way Rake invokes these commands, we can't
     # have more than one arg passed through...annoying.
     args = ("course_id", )