Pyexcel-io

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**added**

. `pyexcel148 <https://github.com/pyexcel/pyexcel/issues/148>`_, support
force_file_type

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**added**

. `49 <https://github.com/pyexcel/pyexcel-io/issues/49>`_, support additional
options when detecting float values in csv format. default_float_nan,
ignore_nan_text

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**fixed**

. `48 <https://github.com/pyexcel/pyexcel-io/issues/48>`_, turn off pep 0515
. `47 <https://github.com/pyexcel/pyexcel-io/issues/47>`_, csv reader cannot
handle relative file names

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**fixed**

. `46 <https://github.com/pyexcel/pyexcel-io/issues/46>`_, expose `bulk_save`
to developer

--------------------------------------------------------------------------------

**fixed**

. Issue `45 <https://github.com/pyexcel/pyexcel-io/issues/45>`_, csv reader
throws exception because google app engine does not support mmap. People who
are not working with google app engine, need not to take this update. Enjoy
your Christmas break.

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**updated**

. PR `44 <https://github.com/pyexcel/pyexcel-io/pull/44>`_, use unicodewriter
for csvz writers.