Merge from 1.0.11

[rpaschoal]

This pull request will add browser notifications and the following output events:

• onUserClicked
• onUserChatOpened
• onUserChatClosed.

[codecov]

Codecov Report

Merging #53 into master will decrease coverage by 2.06%.
The diff coverage is 78.72%.

@@            Coverage Diff            @@
##           master     #53      +/-   ##
=========================================
- Coverage   76.36%   74.3%   -2.07%     
=========================================
  Files          10      10              
  Lines         330     393      +63     
  Branches       56      74      +18     
=========================================
+ Hits          252     292      +40     
- Misses         56      70      +14     
- Partials       22      31       +9

Impacted Files	Coverage Δ
src/ng-chat/ng-chat.component.ts	69.36% <78.72%> (-1.58%)	⬇️

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