Address code review
Disable computed properties in TypeScript 1.4

Conflicts:
	src/compiler/diagnosticInformationMap.generated.ts
	src/compiler/diagnosticMessages.json
Don't quote the word 'generators' in error messages

Conflicts:
	src/compiler/diagnosticInformationMap.generated.ts
Merge disallow computed property grammar error; there are still errors from generator and the fact that other grammar check haven't moved yet