Add "Introduce parameter..." code action

[fbricon]

Given:

    public void foo(){
        greeting();
    }

    private void greeting() {
        System.out.println("Hello World");
    }

The "Hello World" string could be refactored as a method parameter to give:

    public void foo(){
        greeting("Hello World");
    }

    private void greeting(String text) {
        System.out.println(text);
    }

In Eclipse IDE and Intellij IDEA, this corresponds to the "Introduce Parameter..." refactoring.