add Application Started event

Conflicts:
	WordPress/src/main/java/org/wordpress/android/WordPress.java
getBooleanRemoteControlField: default to false in case the field it not explicitly equals _true_

Conflicts:
	WordPress/src/main/java/org/wordpress/android/analytics/AnalyticsTracker.java
trim memory tracking clean up

Conflicts:
	WordPress/src/main/java/org/wordpress/android/WordPress.java
track TRIM_MEMORY_COMPLETE in a separate event

Conflicts:
	WordPress/src/main/java/org/wordpress/android/WordPress.java
	WordPress/src/main/java/org/wordpress/android/analytics/AnalyticsTracker.java
	WordPress/src/main/java/org/wordpress/android/analytics/AnalyticsTrackerMixpanel.java