Run js tests with karma

[salman2013]

Description: Run Js tests with karma.

Note: This is a draft PR, right now tests are running on the following specs. For further specs it is under progress.

1. async_process_spec.js
2. completion_spec.js
3. general_spec.js
4. initialize_spec.js
5. iterator_spec.js
6. resizer_spec.js
7. sjson_spec.js
8. social_share_spec.js
9. video_context_menu_spec.js
10. video_focus_grabber_spec.js
11. video_full_screen_spec.js
12. video_play_pause_control_spec.js
13. video_play_placeholder_spec.js
14. video_play_skip_control_spec.js
15. video_quality_control_spec.js
16. video_save_state_plugin_spec.js
17. video_skip_control_spec.js
18. video_storage_spec.js
19. video_transcript_feedback_spec.js
20. video_volume_control_spec.js
21. video_autoadvance_spec.js

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How to test PR locally:

Dependencies Requirements:

• Install Node.js + npm
• Install dependencies (npm install)
• As the karma run tests on browser so make sure browsers are installed on your machine, right now in this draft PR tests are running on Firefox so it would need firefox browser but in case you want to test on chrome, update the browsers field in 'karma.common.conf' file.

like in karma.common.conf.js

browsers: ['Firefox'] --> browsers: ['Chrome']

How to run:

• Run npm run build-dev command to build webpack config in development mode.
• Run npm run karma-debug command to run the karma tests.

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[salman2013]

Creating new PR #92