Give public access to SimpleNode

[opeongo]

Public access to SimpleNode is required to walk the AST and extract information (e.g. pretty-printing). The SimpleNode class is currently package protected. Changing this to public access will allow applications to do interesting things.

public class SimpleNode implements Node, Serializable {

[nickl-]

Please give examples, not clear what purpose is.

[opeongo]

The purpose is to walk the AST and extract information, for example for pretty-printing.