Initial submission to provide Production build support for Walt-explorer

[randy7d0]

This submission supports "Production" build mode, in addition to, existing "Development" build. It essentially addresses the requirement of the following story to some extent:

https://github.com/ballercat/walt/issues/128

To execute production build, "build:prod" mode has been added to package.json (in ~/packages/walt-docs/) It reduces output JS file, explorer.js, by about 50% Following testings have been performed for this submission:

• manually loading explorer.js file from /docs folder
• npm test

[coveralls]

Pull Request Test Coverage Report for Build 220

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.621%

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Totals
Change from base Build 212:	0.0%
Covered Lines:	1923
Relevant Lines:	1923

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💛 - Coveralls