Change log for python-auth-credential

1.0	Mon Mar  4 2013
	* [mp] pep8 compliancy
	* [mp] moved module to cern-mig github organization

0.6	Tue Apr 17 2012
	* [mp] improvements and bug fixing

0.5	Fri Jan 20 2012
	* [mp] modules added

0.1	Tue Nov 22 2011
	* [mp] first release

[mp] = Massimo Paladin <massimo.paladin@gmail.com>