Upgrade legacy symbols in tests

- iD.Context -> iD.coreContext
- iD.Graph -> iD.coreGraph
- iD.Node -> iD.osmNode
- iD.Way -> iD.osmWay
- iD.Relation -> iD.osmRelation

index.html

@@ -13,7 +13,7 @@
         <div id='id-container'></div>
         <script>
 
-        id = iD.Context()
+        id = iD.coreContext()
             .assetPath('dist/');
 
         // disable boundaries (unless we have an explicit disable_features list)