Update server-methods.md

Fix json in example "add method"
Add my rabbitMQ plugin 

Hey, I've create a little rabbitMQ integration for hapi.js. It would be great if you guys would integrate hapi-rabbit into your plugin directory.
Thanks, Andre
Update plugins.js

Add hapio
Fixed plugin documentation
Merge pull request #107 from gabel/beta

Fixed plugin documentation
fix register functions
Merge pull request #104 from allevo/patch-1

Update server-methods.md
Merge pull request #105 from aduis/patch-1

Add my rabbitMQ plugin
Merge pull request #106 from Caligone/beta

Add hapio plugin
Merge pull request #108 from lloydbenson/beta

fix register functions