Update to latest version of google analytics code (#2671)

* trying to implement new googleanalytics tracker

* trying to put new google tracker. Not working...

* more dev options for testing

still don"t understand wants goes wrong

* New version. Seems to work

* achieved update for new tests
brought back tiddlywiki.com settings value
created a settings tab to make it easier

* adding settings to plugin

add a settings tab to plugin to make it easier to use and see which GA account is in use

* fixes bug with GA_ACCOUNT and GA_DOMAIN tiddlers containing newlines at their end, preventing plugins to work

* soft rebase on jermolene's master

* revert to oldest version of GA_account and GA_domain tiddlers - had been overwritten by ones with a new line at the end

* Integrates some @tobibeer comments

* googleanalytics.js : removed "rebranding", var declaration and console log. Did not manage to get a non-minified version of Google script. But as far as I can see, jermolene's original plugin did same way
* plugin.info : placed "readme" first
* readme : back to previous "legacy" version. No more mention to temporary fork. Added mention and link to google official code.

* signed CLA

plugins/tiddlywiki/googleanalytics/plugin.info

@@ -2,6 +2,8 @@
 	"title": "$:/plugins/tiddlywiki/googleanalytics",
 	"description": "Google Analytics: website statistics",
 	"author": "JeremyRuston",
+	"contributor": "Sylvain Comte",
+	"version":"5.1.14",
 	"core-version": ">=5.0.0",
-	"list": "readme usage"
+	"list": "readme settings usage"
 }