Fix and update travis

Remove .coveragerc because new tests creates its own
Port to v8
PEP-8 compliant
Merge pull request #72 from alexis-via/8.0-port-optional_quick_create

base_optional_quick_create: port to v8 + PEP-8 compliance
[FIX] This fixes #73
Check if the model still exists in the registry before registring the 'check_quick_create' hook
Merge pull request #75 from acsone/8.0-fix-base-optional-quick-create-attributeerror

[FIX] This fixes #73
Merge pull request #69 from savoirfairelinux/fix_travis

Fix and update travis
Merge pull request #2 from OCA/8.0

Actualiza repositorio