Merge branch 'master' of github.com:ultimaker/Cura into per_object_settings

* 'master' of github.com:ultimaker/Cura: (49 commits)
  15.10 restyling of the sidebar header
  15.10 restyling of the sidebar header
  15.10 restyling of the sidebar
  split magic_mesh)surface_mode into Normal, Surface, Both
  Added preference to disable automatic scale
  Removed unused import
  Added changeLog plugin
  Added missing )
  Merging of mine and Jaimes work
  Removed font from rectangle
  JSON: git diff! removed triangles and grid top/bottom skin options (though they are available)
  Code style & switch to translation catalog
  15.10 re-alignment of the toolbar
  15.10 New Icons
  15.10 restyling of the savebutton Area
  Added message asking about sending data to server
  Added exception handling for checking overlap.
  Fixed default button for general and view page
  Fixed double ID in qml
  Removed unused import
  ...

plugins/CuraEngineBackend/CuraEngineBackend.py

@@ -132,6 +132,7 @@ class CuraEngineBackend(Backend):
                     if not getattr(node, "_outside_buildarea", False):
                         temp_list.append(node)
             if len(temp_list) == 0:
+                self.processingProgress.emit(0.0)
                 return
             object_groups.append(temp_list)
         #for node in DepthFirstIterator(self._scene.getRoot()):
@@ -250,6 +251,10 @@ class CuraEngineBackend(Backend):
         self._socket.registerMessageType(6, Cura_pb2.SettingList)
         self._socket.registerMessageType(7, Cura_pb2.GCodePrefix)
 
+    ##  Manually triggers a reslice
+    def forceSlice(self):
+        self._change_timer.start()
+
     def _onChanged(self):
         if not self._profile:
             return