Support for Rust 1.0?

[alexispurslane]

When I try to compile rust-peg with rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14), it fails with these errors:

/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:255:65: 255:75 error: type `&collections::string::String` does not implement any method in scope named `to_tokens`
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:255          println!("[PEG_TRACE] Attempting to match rule {} at {}:{}", $rule_name, line, col);
                                                                                                                                                                             ^~~~~~~~~~
note: in expansion of quote_expr!
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:253:3: 265:5 note: expansion site
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:261:71: 261:81 error: type `&collections::string::String` does not implement any method in scope named `to_tokens`
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:261              Matched(_, _) => println!("[PEG_TRACE] Matched rule {} at {}:{}", $rule_name, line, col),
                                                                                                                                                                                      ^~~~~~~~~~
note: in expansion of quote_expr!
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:253:3: 265:5 note: expansion site
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:262:72: 262:82 error: type `&collections::string::String` does not implement any method in scope named `to_tokens`
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:262              Failed => println!("[PEG_TRACE] Failed to match rule {} at {}:{}", $rule_name, line, col)
                                                                                                                                                                                       ^~~~~~~~~~
note: in expansion of quote_expr!
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/translate.rs:253:3: 265:5 note: expansion site
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/rustast.rs:20:11: 20:40 error: type `syntax::parse::ParseSess` does not implement any method in scope named `new`
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/rustast.rs:20     let ps = syntax::parse::ParseSess::new();
                                                                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/rustast.rs:32:11: 32:40 error: type `syntax::parse::ParseSess` does not implement any method in scope named `new`
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/rustast.rs:32     let ps = syntax::parse::ParseSess::new();
                                                                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/rustast.rs:40:11: 40:40 error: type `syntax::parse::ParseSess` does not implement any method in scope named `new`
/Users/christopherdumas/.cargo/registry/src/github.com-1ecc6299db9ec823/peg-0.3.0/src/rustast.rs:40     let ps = syntax::parse::ParseSess::new();
                                                                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: aborting due to 6 previous errors
Could not compile `peg`.

[untitaker]

See #72