Pyexcel-io

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**Added**

. `21 <https://github.com/pyexcel/pyexcel-io/issues/21>`__, choose subset from
data base tables for export
. `22 <https://github.com/pyexcel/pyexcel-io/issues/22>`__, custom renderer if
given `row_renderer` as parameter.

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**Added**

. support pagination. two pairs: start_row, row_limit and start_column,
column_limit help you deal with large files.
. `skip_empty_rows=True` was introduced. To include empty rows, put it to
False.

**Updated**

. `20 <https://github.com/pyexcel/pyexcel-io/issues/20>`__, pyexcel-io
attempts to parse cell contents of 'infinity' as a float/int, crashes

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**Added**

. csv format: handle utf-16 encoded csv files. Potentially being able to decode
other formats if correct "encoding" is provided
. csv format: write utf-16 encoded files. Potentially other encoding is also
supported
. support stdin as input stream and stdout as output stream

**Updated**

. Attention, user of pyexcel-io! No longer io stream validation is performed in
python 3. The guideline is: io.StringIO for csv, tsv only, otherwise BytesIO
for xlsx, xls, ods. You can use RWManager.get_io to produce a correct stream
type for you.
. `15 <https://github.com/pyexcel/pyexcel-io/issues/15>`__, support foreign
django/sql foreign key

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**Added**

. autoload of pyexcel-io plugins
. auto detect `datetime`, `float` and `int`. Detection can be switched off by
`auto_detect_datetime`, `auto_detect_float`, `auto_detect_int`

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**Added**

. yield key word to return generator as content