alias support

[hoodie]

Hey, I just noticed that alias were intended but are not fully implemented.
I could use this feature.
Could you finish it or perhaps give me some hints so I can do it?
Thank you.

[chyh1990]

Alias is on the TODO list. The scanner & parser do support alias, but the top level YamlLoader leaves it unimplemented.

See https://github.com/chyh1990/yaml-rust/blob/master/src/yaml.rs#L140

I'll implement it next week if I have time :-)

[hoodie]

Hey, thanks. I'd already found that line, and started thinking about just sending you a PR, but I found it a bit too complicated for a quick contribution.

[hoodie]

Hey there :D

[chyh1990]

here's my implementation, not tested much

https://github.com/chyh1990/yaml-rust/tree/alias

[hoodie]

Thanks, I'll put it to the test!