Decide what to do about '/'

```
One of our users correctly pointed out that we're disagreeing with the standard
in our treatment of the '/' character.

https://groups.google.com/forum/#!topic/google-gson/c77R5HgDk3o

This isn't a regression; As far as I can tell we've always had this behavior.
In fact, android.util.JsonReader was changed to do it this way for consistency
with GSON on this change: eb97c0ddc063176c26065fc6855188edf0c16e03
```

Original issue reported on code.google.com by `jessewil...@google.com` on 17 Aug 2011 at 7:40