If there is some other way this is supposed to be done, let me know. As far as I can tell, there are only two ways to do it. Either we pass the tag and style in as parameters, as this pull request does, or it gets this info from a "TagSchema" object, passed in though the Emitter initializer, which dictates the details how objects translate into YAML. The later is actually more flexible and probably more in accordance to YAML spec, however it is also more complex. Also, the two approaches aren't mutually exclusive, so taking the simpler approach for now seemed the best way forward.

I can rebase this to one commit, but I am awaiting feed back to finalize.

@trans I didn't have time to look at this specifically. I think the changes to the YAML::Emitter are OK, but I don't see a strong reason to add these options to Array, Hash and other types.

Eventually we'll add support for different YAML schemas, and there we'll use the tag attribute. But tag attributes should normally be used in relation to a schema, not loosely (as in, use this tag with this array instance)