New release of ITS - v0.04
New release of ITS - v0.04

    value_atts method in ITS::Rule
    ITS::Node::copy copies shallowly by default
    ITS::Node::doc_node returns null for orphans
    Improved documentation

renatb/ITS2.0-WICS-converter,renatb/ITS2.0-WICS-converter