revert mysterious import change

@TheBizzle doesn't remember why this was included in
47be69d4144a74f7b01e92fb48423cd87f9dc4c0, so I'm reverting.  if it ends
up needing to be reinstated for some reason neither of us can
currently fathom, it should be commented.
Introducing Benchmarker 1.0
Adding version number of JS engine to benchmark

It just makes sense to include version numbers of external libraries
into the benchmarks, since changing version numbers can change speed.
Minor package-pushing (refactoring)
Pumping up the private sector
Refactoring trait to use a type variable

It's just easier to deal with unification/parameterization this way
Adding SpiderMonkey support
Fixing tests

Derp
Making Tortoise Shell work again

Whoops
Adding simple HTML test page for Tortoise engine
Making `TortoiseFixture` easier to debug with
Adding comment to self for rewrite
Getting "egregious" language tests working
Documenting how much this branch sucks
Properly declaring class-level variables as such in the engine
Adding js_cols for collection support

Should probably replace with Mori (from ClojureScript) before long
Using a red-black tree to manage links

Causes moderate performance improvement
Notes to self
Notes to self
Improving agentset equality results