logging macros are moved out to the separate crate `log`.
Replace ~[T] to std::vec_ng::Vec<T> as possible
Replace Vec::from_slice([...]) to vec!(...) macro

to improve readability and effecienty. Thanks to @Ogeon.
Rust update: `libextra` is deleted. `extra::url` has moved out to a separate library
Merge pull request #66 from Kroisse/liblog

Logging macros are moved out to the separate crate `log`.
Merge pull request #65 from amesee/rust-update-libextra-url

`libextra` is deleted. `extra::url` has moved out to a separate library.
Merge pull request #67 from Kroisse/vec_ng

Replace old owned vectors to std::vec_ng::Vec<T> as possible