Commented Issue: Missing constructor for 64-bit number in json [351]

One bit of the puzzle to integrate 64-bit numbers in JSON seems to be missing. You only provide the following methods to create numbers:


```
static _ASYNCRTIMP value __cdecl number(double value);
static _ASYNCRTIMP value __cdecl number(int32_t value);
```

Obviously one of the missing static method would look like this:

```
web::json::value web::json::value::number(int64_t value)
{
return web::json::value(value);
}
```

Comments: Hi Steve, thanks, I somehow missed the value constructors. I'll contribute as soon as codeplex allows me to fork the casablanca repository, for the last 24 hours I only got "The source control server is currently unavailable. Please try again later." when trying. Also thanks for the nice work! Hannes