Add Node Security Platform (GitHub) integration to check for Vulnerabilities

[nelsonic]

Why ?

Given that this module/plugin is used as the core of all our Hapi apps
(and apparently a few other people in the community are using it too ...)

It follows that we want a 3rd party tool to check for any security issues in our code or dependencies.

What ?

https://nodesecurity.io/services

Cost/Benefit ?

Cost: It's free for open source so the only "cost" is the time to set it up.
Benefits: better visibility of security and greater confidence for anyone using the module.

(How ?) Todo:

This will not require a code update it's just a GitHub integration and badge in the readme.

• add nsp github integration
• add nsp "badge" to readme