only use __init__.py for imports

[chadwhitacre]

Reticketed from #448.

[pjz]

I think this is mostly done. Concur, @whit537 ?

[chadwhitacre]

$ cat `find aspen -name \__init__.py` | wc -l
     982

[chadwhitacre]

No. :)

[pjz]

Oh, hunh, i was only thinking about aspen/__init__.py. Fair enough.