Update npm devDependencies
Update npm devDependencies

The following devDependencies has been updated based on david-dm
recommendations:

- http-server has been updated to 0.8.0
- protractor has been updated to 2.0.0
- shelljs has been updated to 0.4.0

Resolves gh-39.

rashidi/announcement-board,rashidi/announcement-board,StarTrackDevKL/announcement-board,StarTrackDevKL/announcement-board,rashidi/announcement-board,StarTrackDevKL/announcement-board