Pyramid-pagination

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* Fixed Mapper "target" constructor override

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* Removed `distribute` dependency

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* Added option "keep_items"
* Added option "force_list"
* Corrected parameters passed to `map_return`
* Enabled option "comparers" to accept a single string
* Small performance enhancements (moved to generators & tuples where
appropriate)

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* Added support for post-processing the selected objects via the
`map_item`, `map_list`, and `map_return` options

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* Added fix for non-function closure cells

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* First public release