Pyexcel

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Updated:
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. Support pyexcel v0.5.0. Plugin interface updated to Renderer
. removed deprecated save_as and save_to_memory functions

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. json format: serialize date and datetime

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. if a sheet has row_names, its json output become records(a list of dictionary)
instead of a dictionary of row name vs the rest of row values.

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**Updated**

. issue `pyexcel14 <https://github.com/pyexcel/pyexcel/issues/14>`_, index
error when reading a ods file that has non-uniform columns repeated property.

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**Added**

. support pagination. two pairs: start_row, row_limit and start_column,
column_limit help you deal with large files.
. use odfpy 1.3.3 as compulsory package. offically support python 3