Pyexcel-ods3

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**Updated**

. put dependency on pyexcel-io 0.5.0, which uses cStringIO instead of StringIO.
Hence, there will be performance boost in handling files in memory.

**Relocated**

. All ods type conversion code lives in pyexcel_io.service module

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**Updated**

. update dependency to use pyexcel-ezodf v0.3.3 as ezodf 0.3.2 has `the bug
<https://github.com/pyexcel/pyexcel-ezodf/issues/1>`_, cannot handle file
alike objects and has not been updated for 2 years.

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**Updated**

. `pyexcel14 <https://github.com/pyexcel/pyexcel/issues/14>`_, close file
handle
. pyexcel-io plugin interface now updated to use `lml
<https://github.com/chfw/lml>`_.

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**Updated**

. issue `pyexcel8 <https://github.com/pyexcel/pyexcel/issues/8>`_,
PT288H00M00S is valid duration

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**Added**

. Recognize currency type