Upgraded VRViewer:

- upgraded vrviewer to latest master (ffbc9ff4bf0c550cc79003ec188ca16e9e83c31e)
- added some notes on how to upgrade to the readme
- added support for setting default yaw angle
- added support for float properties

pillar/api/node_types/hdri.py

@@ -7,6 +7,11 @@ node_type_hdri = {
     'description': 'HDR Image',
     'parent': ['group_hdri'],
     'dyn_schema': {
+        # Default yaw angle in degrees.
+        'default_yaw': {
+            'type': 'float',
+            'default': 0.0
+        },
         'status': {
             'type': 'string',
             'allowed': [