Feature/job runner

What is in the box:

* we are now using a job runner to process the bulk upload. Required Redis and RQ
* the job results is now shown on the bulk upload view using an ajax refresh loop
* new api endpoint : `api/common/v1/jobs/<job_id>`
* new admin interface : `/job-runner/` : list the job failed and queued
* a new `.env` file to load virtualenv and environment variables. Now the [Makefile](https://github.com/jplusplus/detective.io/compare/develop...feature%2Fjob-runner#diff-b67911656ef5d18c4ae36cb6741b7965R7) use this file
* the folder `lib/` is now include in the $PYTHONPATH, for python dependencies 
* new line in the procfile ,so a new `worker: python manage.py rqworker high default low`