Merge pull request #2695 from edx/will/revert-paver-again

...ngoapps/contentstore/management/commands/delete_course.py

...apps/contentstore/management/commands/edit_course_tabs.py

cms/djangoapps/contentstore/management/commands/xlint.py

cms/envs/bok_choy.py

...angoapps/edxmako/management/commands/preprocess_assets.py

...apps/student/management/commands/anonymized_id_mapping.py

docs/en_us/developers/source/index.rst

docs/en_us/developers/source/pavelib.rst

docs/en_us/internal/development.md

docs/en_us/internal/discussion.md

lms/envs/bok_choy.py

lms/static/coffee/README.md

pavelib/__init__.py

pavelib/assets.py

pavelib/docs.py

pavelib/prereqs.py

pavelib/servers.py

pavelib/utils/__init__.py

pavelib/utils/cmd.py

pavelib/utils/envs.py