[ADD] add hr_experience module

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
Merge pull request #1 from savoirfairelinux/7.0-hr-experience

[ADD] hr_experience module.
Fix pep8 on __init__ files
Pep8 Spelling and logic
Add aeroo reports