title: Django + postgres relation does not exist error
body: <p>I understand how many questions there are for this matter but none of the solutions suggested helped. 
  I got the following problem: 
  I deleted my models and deleted the imports in <code>admin.py</code> as well. Then I wanted to update the django database with <code>makemigrations</code> which shows that it deletes the model employee but then after using <code>migrate</code> command I saw an error that the relation does not exist. I also dropped it from the postgres database that I used. 
  The strange thing here is that migrate keeps looking for the model which does not exists. Even if I create another one <code>makemigrations</code> detects it and then <code>migrate</code> says <code>relation project_employee..</code> 
  Tried <code>syncdb --all</code> no success. here is the output of <code>migrate</code></p>
  
  <pre><code>Apply all migrations: sessions, project, admin, auth, contenttypes
  Running migrations:
  Applying project.0003_auto_20160318_1215...Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/django/db/backends/utils.py", line 65, in execute
  return self.cursor.execute(sql, params)
  psycopg2.ProgrammingError: relation "project_employee" does not exist
  
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
   File "manage.py", line 10, in &lt;module&gt;
    execute_from_command_line(sys.argv)
  File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
  utility.execute()
  File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 377, in execute
  self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/lib/python3/dist-packages/django/core/management/base.py", line 288, in run_from_argv
  self.execute(*args, **options.__dict__)
  File "/usr/lib/python3/dist-packages/django/core/management/base.py", line 338, in execute
  output = self.handle(*args, **options)
  File "/usr/lib/python3/dist-packages/django/core/management/commands/migrate.py", line 161, in handle
  executor.migrate(targets, plan, fake=options.get("fake", False))
  File "/usr/lib/python3/dist-packages/django/db/migrations/executor.py", line 68, in migrate
  self.apply_migration(migration, fake=fake)
  File "/usr/lib/python3/dist-packages/django/db/migrations/executor.py", line 102, in apply_migration
  migration.apply(project_state, schema_editor)
  File "/usr/lib/python3/dist-packages/django/db/migrations/migration.py", line 108, in apply
  operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
   File "/usr/lib/python3/dist-packages/django/db/migrations/operations/fields.py", line 84, in database_forwards
  schema_editor.remove_field(from_model, from_model._meta.get_field_by_name(self.name)[0])
   File "/usr/lib/python3/dist-packages/django/db/backends/schema.py", line 431, in remove_field
  self.execute(sql)
   File "/usr/lib/python3/dist-packages/django/db/backends/schema.py", line 111, in execute
  cursor.execute(sql, params)
   File "/usr/lib/python3/dist-packages/django/db/backends/utils.py", line 81, in execute
  return super(CursorDebugWrapper, self).execute(sql, params)
   File "/usr/lib/python3/dist-packages/django/db/backends/utils.py", line 65, in execute
  return self.cursor.execute(sql, params)
   File "/usr/lib/python3/dist-packages/django/db/utils.py", line 94, in __exit__
  six.reraise(dj_exc_type, dj_exc_value, traceback)
   File "/usr/lib/python3/dist-packages/django/utils/six.py", line 658, in reraise
  raise value.with_traceback(tb)
   File "/usr/lib/python3/dist-packages/django/db/backends/utils.py", line 65, in execute
  return self.cursor.execute(sql, params)
   django.db.utils.ProgrammingError: relation "project_employee" does not exist
  </code></pre>
  
  <p>`</p>
  
  <p>Thank you </p>