:hook gets in the way during fresh install

I have a few tasks wrapped under `setup:deploy` to prepare a new instance. As I deploy for the first time, `rvm:hook` gets executed very early on and prevents me from doing my own rvm installation:

```
namespace :rvm do
task :install do
on roles(:all), in: :sequence do
execute %q(gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3)
execute %q(\curl -sSL https://get.rvm.io | bash -s stable --autolibs=3 --ruby=2.2.1)
end
end
end
```

The line `after stage, 'rvm:hook'` (of this gem) starts `rvm:hook` before my `rvm:install` runs. It fails, obviously, but also does not let me proceed to install rvm. I went around that by forcing my task to run earlier: `before :hook, :install`, - but that obviously would run each time I ran `cap production deploy`, which is not what I want.

Ideally, I'd prefer the gem to provide its own `:install` which would let me install rvm in an independent execution - something that I could then include in my own task for setting up new instances. Either that - or tie `:hook` to a later stage that would not be executed before tasks that are not code deploys.