Karlovskiy Alexey

@FiloSottile i've added the new method `StyledString` so we can now use custom style (attributes map). Also, i've added `DC` and `UID` to be compliant with rfc2253 and `T`, `DN`...

> Adding an API would require a proposal, and since this is already implementing an obsolete RFC, I don't think we'll want to do that. Sorry didn't know about that....