Version 0.3
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- Remove ``as_grey``, ``dtype`` keyword from ImageCollection
- Remove ``dtype`` from imread
- Generalise ImageCollection to accept a load_func

Version 0.3
-----------
- Remove ``as_grey``, ``dtype`` keyword from ImageCollection
- Remove ``dtype`` from imread
- Generalise ImageCollection to accept a load_func

Version 0.4
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- Switch mask and radius arguments for median_filter

Add note about changed arguments for median_filter
DOC: Add note about changed arguments for median_filter
