Use pkg_resources to keep the package zip-safe

[superseed]

This resolves a bug in the packaging of this package, which I encountered after Faker started depending on it recently.

When text_unidecode is installed manually from a source distribution, in a PYTHONDONTWRITEBYTECODE=1 environment, it ends up in the shape of a zipfile egg in site-packages, as it is not marked zip-unsafe. This means that importing it will result in an error, because this instruction will try to open a file in what it thinks is a directory, when it is actually a zipfile. The package could be marked as zip-unsafe, but there is an even better way to solve the problem:

from pkg_resources import resource_filename
_data_path = resource_filename(__name__, 'data.bin')

pkg_resources (which is part of setuptools) will take care of unzipping and caching the data file, returning a valid filename which can be consumed.

This changeset also removes two redundant lines from Manifest.in:

• README.rst as it is part of the default README files
• src/text_unicode/data.bin because it refers to an non-existent file (the package name has a typo in it), but would be redundant anyway as data.bin is specified as part of package_data in setup.py

EDIT: Corrected code quote as I pasted the wrong line.

[frivoire]

This fix would be very usefull.
Review and merge would be very appreciated :)

[kmike]

Thanks @superseed, it makes sense!