soft deletes available for applications and environments

- parent relation will not include applications or environments marked
  as deleted
- domain classes will exclude deleted objects from selections
- changed some test factories to use domain_word for resource names,
  because they were using person names and it bugged me

tests/models/test_application.py

@@ -1,4 +1,8 @@
-from tests.factories import ApplicationFactory, ApplicationRoleFactory
+from tests.factories import (
+    ApplicationFactory,
+    ApplicationRoleFactory,
+    EnvironmentFactory,
+)
 
 
 def test_application_num_users():
@@ -9,3 +13,11 @@ def test_application_num_users():
 
     ApplicationRoleFactory.create(application=application)
     assert application.num_users == 1
+
+
+def test_application_environments_excludes_deleted():
+    app = ApplicationFactory.create()
+    env = EnvironmentFactory.create(application=app)
+    EnvironmentFactory.create(application=app, deleted=True)
+    assert len(app.environments) == 1
+    assert app.environments[0].id == env.id