Fix trac 444

Make sure we query for '*' whenever we've moved all the way up the tree.
Bring README.md in line with what we've been doing for the past 5 years.
Adjusted OSX compilation note - Authoritative Server only (so far)
Merge pull request #784 from justinclift/master

Adjusted OSX compilation note - Authoritative Server only (so far)
Merge pull request #783 from cyclops1982/444

Bugfix for issue 444 - we can now have wildcards in the root zone again. Thanks cyclops.
Merge branch '454' of github.com:cyclops1982/pdns into 454
s/ip's/IPs/

Thanks @zeha!