Don’t send notifications to dead threads

Also don’t let the looper thread die and log exceptions.
Android seems to have the bad habit of trowing anonymous
runtime exceptions :-S
Merge pull request #481 from realm/ez-notify-dead

Don’t send notifications to dead threads
Added example project + unit tests for ignored properties.
Merge branch 'master' into cm-json-import-api

Conflicts:
	realm/src/main/java/io/realm/Realm.java