Installation fails

I am trying to install it following the README file instructions, and it fails:
```
$ python3 manage.py migrate
Traceback (most recent call last):
File "manage.py", line 15, in
execute_from_command_line(sys.argv)
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
utility.execute()
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 216, in fetch_command
klass = load_command_class(app_name, subcommand)
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 36, in load_command_class
module = import_module('%s.management.commands.%s' % (app_name, name))
File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 986, in _gcd_import
File "", line 969, in _find_and_load
File "", line 958, in _find_and_load_unlocked
File "", line 673, in _load_unlocked
File "", line 673, in exec_module
File "", line 222, in _call_with_frames_removed
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/core/management/commands/migrate.py", line 12, in
from django.db.migrations.autodetector import MigrationAutodetector
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/db/migrations/autodetector.py", line 11, in
from django.db.migrations.questioner import MigrationQuestioner
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/db/migrations/questioner.py", line 9, in
from .loader import MigrationLoader
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/db/migrations/loader.py", line 8, in
from django.db.migrations.recorder import MigrationRecorder
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/db/migrations/recorder.py", line 9, in
class MigrationRecorder:
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/db/migrations/recorder.py", line 22, in MigrationRecorder
class Migration(models.Model):
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/db/models/base.py", line 100, in __new__
app_config = apps.get_containing_app_config(module)
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/apps/registry.py", line 244, in get_containing_app_config
self.check_apps_ready()
File "/home/jsmanrique/grimoirelab/venv/lib/python3.5/site-packages/django/apps/registry.py", line 127, in check_apps_ready
raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.
```

Start with the installation instructions in README and reproduce the documented `python3 manage.py migrate` command. Use the traceback to trace the migration setup from manage.py; done means the installation completes without the reported AppRegistryNotReady error.

Written by the indexing model from the issue text.