Make style accessible to other applications

[alexhairyman]

Would it be okay if an @Property was created so that we could get at the Scalar/Collection style of a node, to verify that a user has used double quotes, single quotes etc. I would gladly make a pull request if you'd merge it.

[kiith-sa]

I added a new module dyaml.hacks that is not imported by the yaml module (must be imported manually) for operations not considered 'standard' by the YAML standard; for now there's accessing/modifying scalar/collection styles.

These are not Node methods, and have intentionally ugly names to make it obvious they're not standard but they can be used with UFCS if dyaml.hacks is imported.

Sorry for the delay, got flooded by irrelevant messages so I didn't notice.