Update README.md

Made secret startup docs a bit more clear
go vet fixes
Merge branch 'master' of https://github.com/skynetservices/skydns
Fix spelling of "incoming".

Worlds. Greatest. Patch.
Merge pull request #25 from drnic/patch-1

Fix spelling of "incoming".
Make the public documentation more Go Like.

Start all methods docs with the name of the method and make
it more readable.
Merge pull request #26 from miekg/doc

Make the public documentation more Go Like.
Move server and api into server pkg

This allows users to easily embed the
skydns server in their applications or allow
easier mocking in their tests.
Merge pull request #27 from crosbymichael/move-server

Move server and api into server pkg
Remove this unneeded comment
Update readme for * as wildcard
Remove 'any' and use '*' for the wildcard

The * is the actual wildcard that can be used in the DNS. Use
this.
Make external API also work with '*'
Update the test to work with * as the wildcard
typo in readme
Update README for callbacks

Some other minor types and added TODO item for patching
other things than only the TTL
First infrastructure for callbacks
Add Callback to Service

Some groundwork for callback, callback will be separately put in the
registry, but linked from each Service.
Extend the registry for callbacks

Add {Add,Remove}Callback to the registry so we can set these callbacks
Add AddCallbackCommand to command.go