Added a group_hdri node type.

This node type serves the same purpose for hdri as the group_texture
serves for the texture nodes.

pillar/application/modules/blender_cloud/texture_libs.py

@@ -101,7 +101,7 @@ def has_texture_node(proj, return_hdri=True):
     # See which types of nodes we support.
     node_types = ['group_texture']
     if return_hdri:
-        node_types.append('hdri')
+        node_types.append('group_hdri')
 
     count = nodes_collection.count(
         {'node_type': {'$in': node_types},

pillar/manage_extra/node_types/group_hdri.py

@@ -0,0 +1,22 @@
+node_type_group_hdri = {
+    'name': 'group_hdri',
+    'description': 'Group for HDRi node type',
+    'parent': ['group_hdri', 'project'],
+    'dyn_schema': {
+        # Used for sorting within the context of a group
+        'order': {
+            'type': 'integer'
+        },
+        'status': {
+            'type': 'string',
+            'allowed': [
+                'published',
+                'pending',
+            ],
+        }
+    },
+    'form_schema': {
+        'status': {},
+        'order': {}
+    }
+}

pillar/manage_extra/node_types/hdri.py

@@ -5,9 +5,7 @@ node_type_hdri = {
     # bucket (https://cloud.google.com/storage/docs/cross-origin)
     'name': 'hdri',
     'description': 'HDR Image',
-    # This data type does not have parent limitations (can be child
-    # of any node). An empty parent declaration is required.
-    'parent': ['group', ],
+    'parent': ['group_hdri'],
     'dyn_schema': {
         'status': {
             'type': 'string',