Integrate BannerJS module

[studioph]

Currently, the BannerJS module utilized by Banner Proxy is not installed to node_modules folder as to decouple the version being used. However, this causes problems when running the CI unit tests workflow since the cache does a require of banner:

banner-proxy/index/cache.js

Lines 3 to 5 in e911b73

	if (typeof(Banner) === 'undefined'){
	var Banner = require('banner');
	}

which gets executed when rewiring the module for testing:

banner-proxy/test/index.js

Line 9 in e911b73

const index = rewire('../index');

banner-proxy/index/index.js

Lines 3 to 5 in e911b73

	if (typeof(cache) === 'undefined'){
	var cache = require('./cache');
	}

Since the banner module does not exist, the workflow fails.

[studioph]

Currently investigating if possible to mock with rewire