Does Homebrew installed rbenv supported?

I am using Mac OS X as server and not Linux. I am wondering if using Homebrew to install rbenv, will it be supported? I can't seems to get it done no matter what `rbenv_custom_path` I use

```
/usr/local/bin/rbenv
/Users/mech/.rbenv/shims/ruby
/Users/mech/.rbenv/versions/2.1.4/bin/ruby
```

If I set as this:

```
set :rbenv_ruby, '2.1.4'
set :rbenv_custom_path, '/Users/mech/.rbenv'
```

I am unable to make it work with these:

```
set :rbenv_custom_path, '/usr/local/Cellar/rbenv/0.4.0'
set :rbenv_path, '/usr/local/Cellar/rbenv/0.4.0' # Is there such a thing?
```

I always will encounter this:

```
bash: /Users/mech/.rbenv/bin/rbenv: No such file or directory
```

It is quite obvious that I do not have this path: `~/.rbenv/bin/`

Start by tracing how rbenv_custom_path and rbenv_path are interpreted for the listed macOS and Homebrew paths. Reproduce the bash error with the provided rbenv_ruby value, then determine whether Homebrew-installed rbenv can be supported and document the correct configuration or the limitation.

Written by the indexing model from the issue text.