updated travis config

remove travis_run_flake8
set a separate env for testing sale_quotation_sourcing, and it seems that
another addon is changing a return value which makes our tests unhappy

.travis.yml

@@ -4,8 +4,10 @@ python:
   - "2.7"
 
 env:
-  - VERSION="8.0" ODOO_REPO="odoo/odoo"
-  - VERSION="8.0" ODOO_REPO="OCA/OCB"
+  - VERSION="8.0" ODOO_REPO="odoo/odoo" EXCLUDE="sale_quotation_sourcing"
+  - VERSION="8.0" ODOO_REPO="OCA/OCB" EXCLUDE="sale_quotation_sourcing"
+  - VERSION="8.0" ODOO_REPO="odoo/odoo" INCLUDE="sale_quotation_sourcing"
+  - VERSION="8.0" ODOO_REPO="OCA/OCB" INCLUDE="sale_quotation_sourcing"
 
 virtualenv:
   system_site_packages: true
@@ -20,7 +22,6 @@ install:
   - travis_install_nightly
 
 script:
-  - travis_run_flake8
   - travis_run_tests
 
 after_success: