downgrade TypeScript 2.1.4 to 2.0.10 because v2.1.4 is not compatible with angular 2.4.1
downgrade TypeScript 2.1.4 to 2.0.10 because v2.1.4 is not compatible with angular 2.4.1

Team-Directive16/VirtEx,Team-Directive16/VirtEx,Team-Directive16/VirtEx