nd2 support

[jim at rybarski.com]

I'm looking for something that can directly read .nd2 files (an 
undocumented Nikon format that seems to be similar to multipage TIFFs). 
I've found 
this: https://pythonhosted.org/SLOTH/_modules/sloth/read_nd2.html which 
sorta works, though I'd like to clean it up and get it working in 
scikit-image. But before I dive into that, I'd like to know:

1) Is there a better implementation somewhere, or does anyone have 
experience parsing .nd2 files?
2) Since the format can contain hierarchical and multidimensional image 
sets, would this require a new kind of abstraction for the io module? To 
give a concrete example, the microscope data I'm working with contains 16 
fields of view from different xy-positions on the sample slide, and in each 
field of view there are three images for each time index (different 
fluorescence filters). So while it would make sense to use io.MultiImage 
for any given combination of field-of-view and filter, it wouldn't make 
sense to do so for the entire nd2 file. I'm thinking perhaps there could be 
some kind of intermediary object that allows you to drill down through the 
hierarchy and at the end it returns a MultiImage object, or something like 
that.

I'd appreciate any suggestions and I'd love to hear what everyone thinks. 
Thanks!
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