Player - Fix initial options merge

[joaopaulovieira]

Summary

The defaultOptions.playback being overwritten when the received options on Clappr init have the playback options too. The expected behavior is the merge between those two options.

This PR applies the expected behavior using the Zepto $.extend() method with the option for a deep merge approach.

Changes

• Applies the deep merge config on every $.extend call;

How to test

• Play one media;
• Print the value of player.options.playback on developr tools console tab;
  • The object should contain the property recycleVideo: true and controls: true.

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After this PR