Unit-Testing needs to be set up.

[karantakalkar]

Currently, there are following problems with effective unit testing of components and the entire app.

1. fix: edit sms component spec.ts, incorrect component name 'EditSms' instead of 'EditSMS' leads to error upon running ng test
2. build: add karma jasmine HTML reporter to get detailed error analysis.
3. build: (optional) add istanbul-instrument-loader which is a dependency of karma-coverage-istanbul-reporter which offers detailed code coverage.
4. chore: set up karma.conf.js to utlize kjhtml reporter, leaving options to add other reporters if necessary.
5. feat: set up app-testing.module.ts for exporting all testing modules to spec.ts files
6. test: set up all spec.ts files to utilize app.testing.module exports and other corrections necessary for clean test cases.
7. refactor: some changes in component.ts files may also be required to pass tests.(eg.)

[karantakalkar]

This is based on #684