Merge pull request #9174 from piwik/searchengines_and_social_improvements

CHANGELOG.md

composer.json

composer.lock

core/Common.php

core/DataFiles/SearchEngines.php

core/DataFiles/Socials.php

core/UrlHelper.php

plugins/Referrers/API.php

plugins/Referrers/Columns/Base.php

...Referrers/DataTable/Filter/KeywordsFromSearchEngineId.php

...Referrers/DataTable/Filter/SearchEnginesFromKeywordId.php

plugins/Referrers/SearchEngine.php

plugins/Referrers/Social.php

plugins/Referrers/Tasks.php

plugins/Referrers/Visitor.php

plugins/Referrers/functions.php

plugins/Referrers/tests/Unit/ReferrersTest.php

plugins/Referrers/tests/Unit/SearchEngineTest.php

plugins/Referrers/tests/Unit/SocialTest.php

plugins/SEO/Metric/Alexa.php