fix: store tracker instance when creating a new one

Should reduce something.
Bug fix - set tracker in Nightscout.java to prevent always getting generating a new tracker
Merge remote-tracking branch 'origin/wip/cookie' into wip/cookie

Conflicts:
	app/src/main/java/com/nightscout/android/Nightscout.java
log debug for tracker
More i18n cleanup
Reduced number of logcat lines in ACRA
Disable Simple prefs
Set default i_understand to false
Merge pull request #6 from nightscout/wip/cookie

Wip/cookie 10.19.14