Pyexcel-io

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**updated**

. pyexcel `pyexcel105 <https://github.com/pyexcel/pyexcel/issues/105>`_,
remove gease from setup_requires, introduced by 0.5.2.
. 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.

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**Fixed**

. `pyexcel-ods25 <https://github.com/pyexcel/pyexcel-ods/issues/25>`_,
Unwanted dependency on pyexcel.

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**Added**

. Collect all data type conversion codes as service.py.

**Updated**

. `19 <https://github.com/pyexcel/pyexcel-io/issues/19>`_, use cString by
default. For python, it will be a performance boost

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**Updated**

. `42 <https://github.com/pyexcel/pyexcel-io/issues/42>`_, raise exception if
database table name does not match the sheet name

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**Updated**

. `41 <https://github.com/pyexcel/pyexcel-io/issues/41>`_, walk away
gracefully when mmap is not available.