[ADD] adds hr_experience module
[IMP] fix the copyright and update to reflect the new fields and views
[IMP] don't need to instantiate a class in 7.0
[IMP] add hr_experience.pot file and delete fr.po
[IMP] separate academic, professional and certfication experiences, pep8
Update hr_experience module.

Create a hr.curriculum base class with all the common fields; make hr.experience,
hr.academic, hr.certification inherit from hr.curriculum