Pyexcel-io

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**Updated**

. `29 <https://github.com/pyexcel/pyexcel-io/issues/29>`_, change
skip_empty_rows to False by default

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**Added**

. updated versions of extra packages

**Updated**

. `23 <https://github.com/pyexcel/pyexcel-io/issues/23>`_, provide helpful
message when old pyexcel plugin exists
. restored previously available diagnosis message for missing libraries

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**Added**

. lazy loading of plugins. for example, pyexcel-xls is not entirely loaded
until xls format is used at its first attempted reading or writing. Since it
is loaded, it will not be loaded in the second io action.
. `pyexcel-xls11 <https://github.com/pyexcel/pyexcel-xls/issues/11>`_, make
case-insensitive for file type

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**Updated**

. `24 <https://github.com/pyexcel/pyexcel-io/issues/24>`__, pass on batch_size

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**Updated**

. `26 <https://github.com/pyexcel/pyexcel-io/issues/26>`__, performance issue
with getting the number of columns.

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**Updated**

. `23 <https://github.com/pyexcel/pyexcel-io/issues/23>`__, Failed to convert
long integer string in python 2 to its actual value