This change requires some tests to be updated.

This reverts commit b5b8f5ef.

Style it like other such asides

tutorial: add classes

This adds a Rust implementation of the Alioth chameneos-redux benchmark:
http://shootout.alioth.debian.org/u64q/performance.php?test=chameneosredux

This version already seems faster than Clojure, Ruby, and OCaml. I'm running
with N=6,000,000 in about 1m 50s.  Further optimization would be good, though.

I'm talking right now with @eholk about how pipes could be used (this is 1:many)...

Conflicts:
	doc/tutorial.md

Also some minor tweaks.

This reverts commit c4af6e92.

Branch was burning...many, many unresolved imports.