Run test in Travis-CI using Docker

[erozqba]

Fixes #758 by erozqba

Changes proposed in this pull request:

• Update .travis.yml to run test using docker and docker-compose
• ...
• ...

Status

• READY
• HOLD
• WIP (Work-In-Progress)

How to verify this change

Check Travis-CI build.

Deployment notes and migration

• Migration is needed for this change

New translatable strings

• If applicable, I have included updated .po files with new strings (see https://github.com/savoirfairelinux/sous-chef/blob/dev/docs/internationalization.adoc)

Additional notes

If applicable, explain the rationale behind your change.

[coveralls]

Coverage increased (+0.03%) to 95.353% when pulling 07ac23b on erozqba:issue_758 into bbc3954 on savoirfairelinux:dev.

[erozqba]

@lingxiaoyang I have managed to make coveralls work inside the docker container, we have to pass some environment variables of TravisCI.

[coveralls]

Coverage remained the same at 95.326% when pulling f48cc2a on erozqba:issue_758 into bbc3954 on savoirfairelinux:dev.

[coveralls]

Coverage increased (+0.08%) to 95.405% when pulling 5883945 on erozqba:issue_758 into bbc3954 on savoirfairelinux:dev.

[lingxiaoyang]

@erozqba Cool! Thank you for investigating the travis variables!

I think you included some changes of PR #762. We'll have to see if there's any change of #762 that is not included here, for example, (maybe) documentation.

[erozqba]

@lingxiaoyang
I have included the changes of PR #762 that I found we must have as soon as possible, for the other changes we can continue the discussion in PR #762.
I have made a rebase over dev to fix the conflicts.

[coveralls]

Coverage increased (+0.01%) to 95.357% when pulling 7e75542 on erozqba:issue_758 into fe4c262 on savoirfairelinux:dev.

[lingxiaoyang]

Thanks @erozqba. The changes look good.

I'll comment in PR #762 for remaining changes that are not included in your PR.