Bug fixes, using db instead of extras

Merge remote-tracking branch 'origin/save-new-trackers' into redoFileSerialize

Conflicts:
	app/src/main/java/ca/stevenlyall/equitracker/HorseDataManager.java
	app/src/main/java/ca/stevenlyall/equitracker/HorseManagerActivity.java
	app/src/main/java/ca/stevenlyall/equitracker/MainActivity.java
	app/src/main/java/ca/stevenlyall/equitracker/TrackerViewActivity.java