move UserDeployments to a separate file to resolve circular reference
diff --git a/planetstack/core/models/__init__.py b/planetstack/core/models/__init__.py
index e31da37..4e76958 100644
--- a/planetstack/core/models/__init__.py
+++ b/planetstack/core/models/__init__.py
@@ -8,10 +8,11 @@
from .role import Role
from .site import Site,Deployment, DeploymentRole, DeploymentPrivilege, SiteDeployments
from .dashboard import DashboardView
-from .user import User, UserDeployments, UserDashboardView
+from .user import User, UserDashboardView
from .serviceclass import ServiceClass
from .slice import Slice, SliceDeployments
from .site import SitePrivilege, SiteDeployments
+from .userdeployments import UserDeployments
from .image import Image, ImageDeployments
from .node import Node
from .serviceresource import ServiceResource