updated Big5 decoder for the standard update: whatwg/encoding@88a2177754655255df378e1b97cd085420399fe4.
Merge branch 'EncodingObj' of github.com:SimonSapin/rust-encoding
s/EncodingObj/EncodingRef/g.

while &Encoding *is* referred as a trait object in the manual,
there are several meanings attached to the word "object" in Rust
so I feel the current naming is confusing at best.
I think the word "reference" would work better (hence this commit)
and made this change with SimonSapin's consent,
but feel free to challenge this decision if you want ;)
Merge branch 'decode-BOM' of github.com:SimonSapin/rust-encoding with EncodingRef changes
Merge branch 'master' of github.com:lifthrasiir/rust-encoding into rust-0.9-pre
Merge branch 'decode-BOM-0.9' of github.com:SimonSapin/rust-encoding into rust-0.9-pre
language update: no more 'self.
Backport to the Rust version used in Servo.