textproc/py-pyexcel-io: Add py-pyexcel-io 0.6.4

pyexcel-io provides one application programming interface (API) to read and
write the data in excel format, import the data into and export the data from
database. It provides support for csv(z) format, django database and sqlalchemy
supported databases. Its supported file formats are extended to cover "xls",
"xlsx", "ods".

WWW: https://github.com/pyexcel/pyexcel-io