- Privatized fields in DnsEntry
- General comment and code format fixes
- ResponseException now subclass of DecoderException
- Resource now implements ByteBufHolder
- DnsResponseHeader now has a public constructor
- Methods setType() and getType() overriden in DnsResponseHeader and
DnsQueryHeader with final keyword to always return respective type
- DnsHeader now throws NullPointerException instead of
IllegalArgumentException in constructor