Pyexcel

* added CONTRIBUTORS.rst into tar ball

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**Updated**

. issue `pyexcel19 <https://github.com/pyexcel/pyexcel/issues/19>`_, not all
texts in a multi-node cell were extracted.

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**Updated**

. issue `pyexcel17 <https://github.com/pyexcel/pyexcel/issues/17>`_, empty new
line is ignored
. issue `pyexcel6 <https://github.com/pyexcel/pyexcel/issues/6>`_,
PT288H00M00S is valid duration

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**Added**

. Recognize currency type

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Updated:
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. Read specific data structure from pure json format: two dimensional
array, a dicionary of list or two dimensional list and a list of records.
. Read newline delimited json. two dimensional arrays, a a dicionary of list
or two dimensional list and a list of records are supported.