Merge pull request #11905 from diosmosis/series-picker-component

plugins/CoreVisualizations/CoreVisualizations.php

...ions/angularjs/series-picker/series-picker.component.html

...ations/angularjs/series-picker/series-picker.component.js

...ions/angularjs/series-picker/series-picker.component.less

plugins/CoreVisualizations/javascripts/seriesPicker.js

plugins/CoreVisualizations/stylesheets/jqplot.css

plugins/Morpheus/javascripts/piwikHelper.js

plugins/TreemapVisualization

.../UI/expected-screenshots/BarGraph_metric_picker_shown.png

...pected-screenshots/EvolutionGraph_metric_picker_shown.png

.../UI/expected-screenshots/PieGraph_metric_picker_shown.png

...ected-screenshots/UIIntegrationTest_exampleui_treemap.png