MediaType improvement for malware attack against known route.

[paul-hammant]

https://github.com/jooby-project/jooby/blob/master/jooby/src/main/java/org/jooby/MediaType.java#L533

This can throw exceptions, of course:

checkArgument(typeAndSubtype.length == 2, "Bad media type found '%s' while parsing '%s'",type, value);

Can they be caught locally, and rethrown as new BadMediaType(cause), please?

This way users of Jooby can have a error block, like so:

        err(BadMediaType.class, (req, rsp, err) -> {
            rsp.send("whatever);
        });

And perhaps BadMediaType is a subclass of RequestParsingException.