Resolve "Estimation de l'état d'avancement d'un job"

Closes #318 (closed)
Considering a job that produces log containing the % of job done, the APIJobView will parse the allgo.log file to return the last value with the key complete.

The regexp used is ^\d*\.*\d+%

# response of api/v1/jobs/6
{
  "complete": "64.00%",
  "status": "running",
  "6": {
    "allgo.log": "https://localhost/datastore/6/allgo.log"
  }
}