Silence warnings in the fixed time equality routines.
Convert to new closure syntax: &fn() -> ||
Remove uses of 'do' calling functions with stack closures.
Update to new names for iterator methods on [u8] and str.
Use some unsafe code to get MutChunkIter to compile again after Rust issue #8624.
Rename mut_chunk_iter() -> mut_chunks() to align with iterator renaming in libstd.
Merge pull request #11 from DaGenix/cleanups

Various cleanups to get everything compiling again