Add public-host option

This feature is needed to support servers with different private and
public ip addresses, e.g. Amazon EC2 instances.

Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html
Update README.md
Update README.md
Update LICENSE
Update package.json
Merge pull request #76 from arb/master

Update Documentation
Merge pull request #74 from wakayama-io/feature/public-host

Add public-host option
Create CONTRIBUTING.md
Update package.json
Upgrading to lab 4
Merge pull request #78 from wpreul/master

Upgrading to lab 4
Update README.md
Update README.md
fixes #79
added new line at end of file simple.js
Merge pull request #80 from chetandhembre/master

fixes #79
Update index.js

Removed unused variables.
Cleaned up tests.
Merge pull request #81 from hapijs/test-cleanup

Cleaned up tests.