Don't track external link as `pageview` in WDN analytics.
Use event metric for the metric.
Merge pull request #434 from smeranda/metric_event

Use the event metric for the metric.
Merge pull request #426 from smeranda/over-aggesive-page-view-tracking

Don't track external link as `pageview` in WDN analytics.
Bumped dependency version number to 3.1.13
Merge branch 'release-3.1.13' into develop