gnocchiclient 7.0.6

Don't use */* in accept header

Pecan 1.4 uses accept header to decide the response content type.
Let's not use '*/*" in accept header as it returns text/plain in
case of errors.

fix: make README compatible with PyPI

gnocchiclient 7.0.4

Remove deprecated cli options

FIX Bug on workaround missing OS_AUTH_TYPE

os.environ.set doesn't existe, must use os.environ["OS_AUTH_TYPE"] = 
for setting environnement variable
https://docs.python.org/2/library/os.html

fix pep8

ignore W504[1]. tbh, not what i prefer.

[1] https://github.com/PyCQA/pycodestyle/issues/197

pep8: enable logging format checks

pep8: fix RST304 errors

  * Using Python 3 for building the doc.