Adds ConsoleTracker to tracking API

Implements a Tracker for the Tracking API that uses System.out to print
UI events. This little helper can help during development time to
identify the page flow. It also acts as an example implementation if
someone wants to build it's own Tracker e.g. to log UI navigation.

Change-Id: I1de2a97338303b818879e7f77522e013beb81282
Merge "Adds ConsoleTracker to tracking API"