+url and $wgExtensionCredits if lacking

also moved a lot of descriptions to descriptionmsg
+more
+more
+more
Adding ?fps=1 option
Merge pull request #5834 from Wikia/fps-meter

Adding ?fps=1 option
Merge pull request #5745 from ty-a/dev

Add URL to Wikia Extensions and $wgExtensionCredits to some that were missing it
Revert "Add URL to Wikia Extensions and $wgExtensionCredits to some that were missing it"
Merge pull request #5839 from Wikia/revert-5745-dev

Revert "Add URL to Wikia Extensions and $wgExtensionCredits to some that...
Merge branch 'dev' into PLATFORM-292-memcache-monitoring