Fix using one delay to control all transitions. (#3932)

* Fix using one delay to control all transitions.

Vue transitions have wrong timing when having CSS like the following:

```
.[transition-name]-enter-active, .[transition-name]-leave-active {
  transition: opacity 0.8s ease, transform 0.7s ease;
  transition-delay: 0.4s;
}
```

Which in turn bubbles errors to the console.

* Fix linting.

src/platforms/web/runtime/transition-util.js

@@ -131,6 +131,10 @@ export function getTransitionInfo (el: Element, expectedType?: ?string): {
 }
 
 function getTimeout (delays: Array<string>, durations: Array<string>): number {
+  while (delays.length < durations.length) {
+    delays = delays.concat(delays)
+  }
+
   return Math.max.apply(null, durations.map((d, i) => {
     return toMs(d) + toMs(delays[i])
   }))