Only used onDestroyed on Jelly Bean MR1+ devices

Fixes crash:
"java.lang.NoSuchMethodError: com.ianhanniballake.contractiontimer.data.a.isDestroyed
	at com.ianhanniballake.contractiontimer.data.a.a(SourceFile:69)
	at com.google.android.gms.internal.bm.a(Unknown Source)
	at com.google.android.gms.common.api.aa.e(Unknown Source)
	at com.google.android.gms.common.api.aa.d(Unknown Source)
	at com.google.android.gms.common.api.ae.a(Unknown Source)
	at com.google.android.gms.internal.bm.a(Unknown Source)
	at com.google.android.gms.internal.bh.handleMessage(Unknown Source)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:130)
	at android.app.ActivityThread.main(ActivityThread.java:3747)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:507)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
	at dalvik.system.NativeStart.main(Native Method)
"
Catch and ignore CampaignTrackingService exceptions