Restore the State field to Project Task

For the cases where some 7.0 processes still rely on the `state` field.
Merge pull request #42 from dreispt/add-task-state

Restore the State field to Project Task
Separated Lint tests
Remove deprecated travis_run_flake8
[LINT]
Merge pull request #49 from yvaucher/8.0-separate-lint

Separated Lint tests
Translation
Merge branch '8.0' of github.com:sysadminmatmoz/project-service into 8.0