VE-1177 Track VisualEditor events at 100% sampling

```
dev-inez:/usr/wikia/source/wiki inez(VE-1355)$ ack-grep "_trackPageview"
extensions/wikia/AnalyticsEngine/js/analytics_prod.js
54:	 *    _gaqWikiaPush(['_trackPageview'], ['_trackEvent', 'cat', 'act']);
181:	_gaqWikiaPush( ['_trackPageview'] );

extensions/wikia/AnalyticsEngine/js/analytics_dev.js
44:     *    _gaqWikiaPush(['_trackPageview'], ['_trackEvent', 'cat', 'act']);
133:    _gaqWikiaPush(['_trackPageview']);
```