Merge pull request #18 from alvarolopez/stable/havana

Minor syntax changes for stable/havana
Update README.md

Use IFCA travis-ci.org account.
Merge pull request #21 from alvarolopez/stable/havana

Stable/havana
Use default_fixtures for tenants instead of hardcoding.
Add role support.

Removed PEP8 error.
Merge pull request #20 from enolfc/role_support

Role support