Clear out existing models on load to avoid conflicts when reloading data

src/app/reducers/entitiesReducer.js

@@ -14,6 +14,13 @@ export function loadData(state, payload) {
 
     const {pilots, designs, mechs} = payload;
 
+    // Clear out any existing models from state so that we can avoid
+    // conflicts from the new data coming in if data is reloaded
+    [Pilot, Mech, MechDesign].forEach(modelType => {
+        modelType.all().withModels.forEach(model => model.delete());
+        session.state = session.reduce();
+    });
+
     // Queue up creation commands for each entry
     pilots.forEach(pilot => Pilot.parse(pilot));
     designs.forEach(design => MechDesign.parse(design));