Update Django

[cuducos]

Opening this PR in favor of #266 because updating Django REST Framework required minor edits on the source code.

This is a basic update: if after updating the packages tests still pass and navigation still works probably we haven't broken anything.

[anaschwendler]

Testing this PR!

1. Clone the repository:

   $ git clone git@github.com:datasciencebr/jarbas.git

2. Open the repo folder:

   $ cd jarbas

3. Checkout to @cuducos branch:

   $ git checkout -b cuducos-update-django origin/cuducos-update-django

4. Update the branch:

   $ git merge master

5. Copy the .env file:

   $ cp contrib/.env.sample env

6. Build and start services:

   $ docker-compose up -d

7. Create the database and apply the migrations:

   $ docker-compose run --rm django python manage.py migrate

8. Seeding it with sample data:

$ docker-compose run --rm django python manage.py reimbursements /mnt/data/reimbursements_sample.xz
$ docker-compose run --rm django python manage.py companies /mnt/data/companies_sample.xz
$ docker-compose run --rm django python manage.py suspicions /mnt/data/suspicions_sample.xz
$ docker-compose run --rm django python manage.py tweets

8. Open http://localhost:8000/ and http://localhost:8000/dashboard and do tests with functionalities and works fine :)

There is some conflicts with the master branch, @cuducos can you solve it and then I merge it?

[cuducos]

Conflicts fixed ; )