Allow the global handlers {} block in scripts to accept Guice beans

[ldaley]

As a mechanism for making things globally accessible…

ratpack {
  modules {
    // add some modules
  }
  handlers { SomeService someService ->
    get("foo") {
      someService.method()
    }
    post("bar") {
      someService.method()
    }      
  }
}

Where SomeService is bound by a module.

[ldaley]

There's a little bit of an unresolved issue here.

Users will try and grab contextual things this way, the most significant of which probably being TemplateRenderer. Will just have to make sure the docs on this are clear.