Added storage.js include to testclient.html + fix for PS issue 236

* testclient.html didn't work anymore since the chat uses the Storage var and js/storage.js wasn't included.
* The exact ability and item wasn't shown for the second active Pokémon on your side (i.e. only the possible ones) in doubles, as described [here](https://github.com/Zarel/Pokemon-Showdown/issues/236).

Forgot to branch before pushing, since two separate pull requests would've been nicer in my opinion, but oh well.