NS: Added AAAA Doc resolver, delegating resolver
Fixed a typo in NameServer comments.
Updated NameServer docs to reflect reality.
'Flipped' MessageBuffer bytes, ftw
Fixed AAAA delegation in NameServer
Factored out the test `Doc` from NameServer
Merge pull request #3 from mesosphere/doc-resolver

NS: Added AAAA Doc resolver, delegating resolver