remove tag_svn_revision to fix test, same as PR #2045
Merge pull request #2116 from bukzor/buck-remove-tag-svn-revision

remove tag_svn_revision to fix test, same as PR #2045
Fix shutil.copytree for py3 when a symlink points to a directory
Prevent circular symbolic links
Add test with circular symbolic links
Revert "Keep symlinks as symlinks when installing"

This reverts commit f579c178bc206004ac332c38ed9155f6e58ccfd3.

Conflicts:

	pip/download.py