[GCI2018] Update Dependencies on /rest-api/package.json

[bauripalash]

Problem :

All the dependencies in /rest-api/package.json has not been updated since Jun 11, 2016, as a result, most of the dependencies are deprecated now, which makes the program vulnerable to security and performance issues.

As an example, the bower library is now deprecated and developers suggest to use Webpack, Parcel and such similar libraries.

Possible Fix:

• Update the dependencies
• Update the source code wherever needed to eliminate the problems created with updating libraries