Update travis to model
Fix pep8
Merge pull request #19 from savoirfairelinux/6.1-travis

6.1 - Update travis to model
[ENH] Module product_pricelist_fixed_price:
    - Backport improvements from 7.0 branch
[FIX] Module product_pricelist_fixed_price:
    - No Price Computation group in 6.1
[MIG] Module product_pricelist_fixed_price:
    - Migrate data from previous versions of module.