to do
/////
[assume all work is for Py3K]

* Move Py3K version over to _fileio._FileIO for file work.
    + Can set as open() if desired (but probably not needed).
    + Make sure that reading/writing to file is done in bytes.
    + Be aware that encoding/decoding from file not guaranteed to work as
      the encodings module might not be available yet.
    + Will compile() do the right thing with bytes, decoding, etc.?
* Always have __file__ point to the .py file if it exists.
* PEP 366.
* Rename _importlib to importlib.
	+ Add a fix_importlib() method that does what importlib currently does.
	+ Will allow for imp to become _importlib and be cleaned up.

Ideas
/////

* Add init_import().
	+ Set sys.meta_path (for when all importers are on there).
	+ Handle using any C implementations from (the future) _importlib.c over
	  the pure Python implementation.
		- Make sure there is a some way to test both versions of anything.