Added callback function to send additional data before pageview is sent #12
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In our application we want to track a number of custom dimensions in addition to the default statistics logged by Google. This requires us to call
ga('set', 'dimensionName', 'value');
beforega('send', 'pageview');
is called (source: https://support.google.com/analytics/answer/2709828). To this end, I've added a custom function to the mixin which is called prior to sending the pageview, with a default empty implementation.