* mem and obj modules are roughly divided between doing memory-specific
things and object-specific things
* Box::new_uninit() is a nightly feature and it's quite useful, so I'm
enabling that for now
* Check out src/obj/attrs.rs for possible undefined behavior in the
Attrs::new() function. I'm sure it'll be just fine.
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>