\o/ if_let and tuple_indexing are unfeature gated.
Use `get_mut` instead of `get_mut_ref` (naming convention).
Explain the purpose of src/buffered.rs.
Drop MemWriter in favor of Vec<u8>.
Remove temporary trait hack for Sized? `Str` impls.
Document write_results, even though it is undocumented.
Try to use lto for benchmarks?

(Doesn't seem to actually work.)
Small tweak.
0.7.2