Update to Typescript 2.1.4

[cgatian]

• Update package.json Typescript to ~2.1.4
• Update awesome-typescript-loader to 3.0.0-beta.9
• Remove all instances of ForkCheckerPlugin from:
  • tsconfig.json
  • webpack.test.js
  • webpack.config.js
• Clear .awcache directory (at least I needed to this may not be required)

[cgatian]

I should also comment, there's probably additional configuration needed. This got me working at least.

[qdouble]

@cgatian I don't think angular officially supports typescript 2.1 though

[cgatian]

There's issues with code coverage.

s-panferov/awesome-typescript-loader#293
s-panferov/awesome-typescript-loader#290

[joshwiens]

The angular team has stated they don't support 2.1.x and users shouldn't switch until Angular 4.x

[qdouble]

Yeah, will wait until Angular team supports it.