Remove rbenv submodule
Squashed 'rbenv/' content from commit 13a474c

git-subtree-dir: rbenv
git-subtree-split: 13a474c4e9c3305179b364723349fc49b3e935e3
Merge commit '4941cafd30986d201438c090ce5e95c422639994' as 'rbenv'
Squashed 'rbenv/plugins/ruby-build/' content from commit c819790

git-subtree-dir: rbenv/plugins/ruby-build
git-subtree-split: c819790848b4e4814262cfc7101a9770a33004d8
Merge commit '008a40669f948d3372a8efc2eabe401ae18c9388' as 'rbenv/plugins/ruby-build'
Add `--rbenv` option to install script
Add DEST parameter to replace_file