add additional flags
remove dnspython
add additional dns parses with names that conform with http://tools.ietf.org/html/draft-bortzmeyer-dns-json-01
There are some valuse not defined in the draft above speficily for the
DS and DNSKEY.
Changed 'Z' back to integer.
Detect if resource record is truncated.
Merge pull request #29 from phicoh/john-changes

Philip merged John's changes into one pull request.