[WIP] Implement Support for TypeScript 1.8

[nycdotnet]

This pull request implements support for TypeScript 1.8.

ToDo:

• [x] Self-compile with TypeScript 1.8
• [x] Fix emit diffs and any broken tests
• [x] Add basic support for new switches:
  • [x] reactNamespace
  • [x] skipDefaultLibCheck
  • [x] pretty
  • [x] allowUnusedLabels
  • [x] noImplicitReturns
  • [x] noFallthroughCasesInSwitch
  • [x] allowUnreachableCode
  • [x] forceConsistentCasingInFileNames
  • [x] allowJs
  • [x] noImplicitUseStrict
• [x] Support new switches in vs.
• [x] Support new switches via tsconfig.
• [x] Add some tests to flesh-out allowJs mode.
• [ ] Add some tests to flesh-out pretty mode. This may not actually be useful for grunt-ts to support.
• [ ] Update internal compiler.
• [ ] Documentation.