oh just moving more stuff around...

also, updated where to just use filter (good ol' createCallback)
OK OK... fine for now, I guess
moving stuff around like a boy scout

adding tests and stuff
think The Great Reorg may soon be over...
OK, know what? I'll finish this later
now groupBy and countBy return object-like sequences
made generic ObjectLikeSequence#get work properly
added StringLikeSequence.define