Fix non-working rake tasks after installation

This fixes `private method 'load' called for nil:NilClass` errors.

Idea from https://github.com/teohm/capistrano-shared_file/pull/2.

I've also bumped the version patchlevel, hope that's fine.

Basically this is only adding two lines around the `load` method for the case
the initializer is not run inside a capistrano deployment:

```ruby
if Capistrano::Configuration.instance
  Capistrano::Configuration.instance.load do
  …
  end
end
```

The rest is just resulting indentation.