Copy to clipboard (#142)

Copy to clipboard (#142)

* Copy buttons on share view

Ugly but working buttons to copy video url and video iframe code.

Add ngx-clipboard dependency to allow easy copy to clipboard directive.

* Designed copy buttons

Using some css (scss) rules to make buttons look better.

* First version on copy feedback

Little success alert message on copy.

Fix lint errors

Move dependencies to dev dependencies

* Update button design

* Use of notifications service

Provides feedback of copy action to the user through the
angular2-notifications module.