generic non-linear filtering that support selem and boundary handling

[Chencan QIAN]

Essentially, this is something similar 
to scipy.ndimage.filters.generic_filter (which is too slow because of its 
internal python for-loop), but implemented in cython as with 
skimage.filter.rank family.

Given the diversity within skimage.filter.rank, a generic function would be 
very useful. For example, I'd like to calculate local variance, which is 
conceptually similar to skimage.filter.rank.mean, but not supported 
currently.

I guess the absence of such a function must be due to some unresolved 
technical obstacle?

Thanks~

Chencan
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