bin/jruby is not updated when bin/jruby.bash is

Because pom.rb says:

``` ruby
profile 'jruby.bash' do
    activation do
      file( :missing => '../bin/jruby' )
    end
```

So it will ignore that bin/jruby.bash is updated.
- Is there a way to specify this dependency in maven?
- Could it be a symlink to jruby.bash so it does not get outdated? (and there is less conflicts with jruby-launcher)
