Allow resolving things other than A records

[richthegeek]

This allows resolution of TXT records and other non-A/AAAA records.

It also uses JSON.stringify/parse to pass data back from the subprocess.

Finally it uses some automated guessing on the argv values, that was causing an issue with testing

[skoranga]

Hi @richthegeek, Doesn't look like this PR is backward compatible. Let me think some more on this and add backward compatibility.

[richthegeek]

Made some changes to make it backwards compatible.

Default behavior when no "type" is passed is to perform a dns.lookup, and I added a "lookup" method to the module which does this also.

[skoranga]

thanks @richthegeek. Will be publishing shortly

[skoranga]

published dns-sync@0.1.3