Updated dagre-d3 to fix missing chrome function

Chrome removed the getTransformToElement function in versions above 48,
which caused dagre-d3 to stop working. The maintainers have released a
fix in version 0.4.13, so I bumped the version we require to 0.4.13 or
above.

package.json

@@ -30,7 +30,7 @@
     "alt": "^0.17.0",
     "bootstrap": "^3.3.4",
     "d3": "^3.5.6",
-    "dagre-d3": "^0.4.10",
+    "dagre-d3": "^0.4.13",
     "dvid": "^0.6.0",
     "moment": "^2.10.3",
     "react": "^0.13.3",