Pyexcel-ods3

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**added**

. `28 <https://github.com/pyexcel/pyexcel-ods3/issues/28>`_: support datetime

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**added**

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**updated**

. pyexcel `pyexcel105 <https://github.com/pyexcel/pyexcel/issues/105>`_,
remove gease from setup_requires, introduced by 0.5.1.
. remove python2.6 test support

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**added**

. `pyexcel103 <https://github.com/pyexcel/pyexcel/issues/103>`_, include
LICENSE file in MANIFEST.in, meaning LICENSE file will appear in the released
tar ball.