Added actors-related code

.bzrignore

examples/actors/xdf/MergeActors.jrag

examples/actors/xdf/SSR.jrag

examples/actors/xdf/xdf.ast

examples/actors/xdf/xdf.jjt

examples/actors/xdfAST/ASTNode$State.java

examples/actors/xdfAST/ASTNode.java

examples/actors/xdfAST/Action.java

examples/actors/xdfAST/ActionTags.java

examples/actors/xdfAST/Actor.java

examples/actors/xdfAST/Args.java

examples/actors/xdfAST/AttrValue.java

examples/actors/xdfAST/Attribute.java

examples/actors/xdfAST/Class.java

examples/actors/xdfAST/ComplexElement.java

examples/actors/xdfAST/Connection.java

examples/actors/xdfAST/Decl.java

examples/actors/xdfAST/DocType.java

examples/actors/xdfAST/Element.java

examples/actors/xdfAST/Encoding.java