load symbol as string

Currently, I think loading symbol as string is a defect of rbyaml.
For example,

>RbYAML.load("--- :sym")
=> ":sym" # It's a string
>YAML.load("--- :sym")
=> :sym # It's a symbol

Starting working on that defect.
You can see more tasks and defects in following URL,
http://code.google.com/p/rbyaml/issues/list