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

atst/domain/applications.py

@@ -1,3 +1,5 @@
+from sqlalchemy.orm.exc import NoResultFound
+
 from atst.database import db
 from atst.domain.environments import Environments
 from atst.domain.exceptions import NotFoundError
@@ -23,7 +25,9 @@ class Applications(object):
     def get(cls, application_id):
         try:
             application = (
-                db.session.query(Application).filter_by(id=application_id).one()
+                db.session.query(Application)
+                .filter_by(id=application_id, deleted=False)
+                .one()
             )
         except NoResultFound:
             raise NotFoundError("application")

atst/domain/environments.py

@@ -51,7 +51,11 @@ class Environments(object):
     @classmethod
     def get(cls, environment_id):
         try:
-            env = db.session.query(Environment).filter_by(id=environment_id).one()
+            env = (
+                db.session.query(Environment)
+                .filter_by(id=environment_id, deleted=False)
+                .one()
+            )
         except NoResultFound:
             raise NotFoundError("environment")