Revert "Revert "Add URL to Wikia Extensions and $wgExtensionCredits to some that were missing it""

This reverts commit 5eef77cf22773881de84c0231266f4a4fe4e9c75.

Conflicts:
	extensions/wikia/AbuseFilterBypass/AbuseFilterBypass.php
	extensions/wikia/AdminDashboard/AdminDashboard.i18n.php
	extensions/wikia/AntiSpamInput/AntiSpamInput.i18n.php
	extensions/wikia/ApiDocs/ApiDocs.setup.php
	extensions/wikia/ArticleMetaDescription/ArticleMetaDescription.php
	extensions/wikia/ArticleSummary/ArticleSummary.setup.php
	extensions/wikia/ArticlesAsResources/ArticlesAsResources.setup.php
	extensions/wikia/AssetsManager/AssetsManager_setup.php
	extensions/wikia/AuthImage/AuthImage_setup.php
	extensions/wikia/AutoMainpageFixer/AutoMainpageFixer.php
	extensions/wikia/CityVisualization/CityVisualization.setup.php
	extensions/wikia/CodeLint/CodeLint.setup.php
	extensions/wikia/CommentCSV/CommentCSV.php
	extensions/wikia/ContentWarning/ContentWarning.i18n.php
	extensions/wikia/CreateInCategory/CreateInCategory.i18n.php
	extensions/wikia/CreatePage/CreatePage.php
	extensions/wikia/DataProvider/DataProvider.php
	extensions/wikia/GlobalNavigation/GlobalNavigation.setup.php
	extensions/wikia/GoogleAnalyticsSampling/GoogleAnalyticsSampling.setup.php
	extensions/wikia/GoogleDocs/GoogleDocs.php
	extensions/wikia/InWikiExternalForm/InWikiExternalForm.setup.php
	extensions/wikia/IndexingPipeline/PipelineEventProducer.setup.php
	extensions/wikia/InstantGlobals/InstantGlobals.setup.php
	extensions/wikia/JSMessages/JSMessages_setup.php
	extensions/wikia/JSVariables/JSVariables.php
	extensions/wikia/JsonFormat/JsonFormat.setup.php
	extensions/wikia/LoaderQueue/LoaderQueue.setup.php
	extensions/wikia/MultiTasks/SpecialMultiWikiFinder.php
	extensions/wikia/RecipesTemplate/RecipesTemplate.i18n.php
	extensions/wikia/SpecialInterwikiEdit/SpecialInterwikiEdit.php
	extensions/wikia/SpecialUnlockdb/SpecialUnlockdb.setup.php
	extensions/wikia/WallNotifications/WallNotifications.setup.php
	extensions/wikia/WikiaInternal/WikiaInternal.i18n.php