Boolean no error passing a String value

```
passing a number to a Boolean I see the error: Expected a boolean but was
NUMBER (OK), passing a string to a Boolean there is no error and is assigned to
the Boolean false (NOT OK)

{"isPRA":10} generate the error (OK)

{"isPRA":"ABC"} no error (NOT OK)

In the example isPRA is a Boolean field and I used gson 2.3

```

Original issue reported on code.google.com by `dmclcu57...@gmail.com` on 14 Oct 2014 at 9:06