React JS template and sdk support

[oniseijin]

As done in #1681 and #1687 have React JS support.
This is mentioned in the Bladerunner js docs as being possible, so, actually doing it would prove a lot and open up more use cases.

This would mean template, unit test, integration test, aspects, blades etc.

Preference is to use React in the same way as knockout/angular, namely the template separate from the code, but this may not be the "React way" and might have only limited support (https://wix.github.io/react-templates/); +JSX support (babel hook)?

[oniseijin]

Next problem: dependencies: there are many and quite a bit more than what I had to do for basic angular2 support; and, having that npm support within brjs would make this much easier. This isn't even babel or react-templates.
react and react-dom:

+-- react@15.4.2
| +-- fbjs@0.8.9
| | +-- core-js@1.2.7
| | +-- isomorphic-fetch@2.2.1
| | | +-- node-fetch@1.6.3
| | | | +-- encoding@0.1.12
| | | | | `-- iconv-lite@0.4.15
| | | | `-- is-stream@1.1.0
| | | `-- whatwg-fetch@2.0.3
| | +-- promise@7.1.1
| | | `-- asap@2.0.5
| | +-- setimmediate@1.0.5
| | `-- ua-parser-js@0.7.12
| +-- loose-envify@1.3.1
| | `-- js-tokens@3.0.1

[briandipalma]

@oniseijin We've put active BRJS work on hold and are focusing on CT.Next which will is based on npm and webpack. I don't see us doing any npm work in BRJS tbh.