Added new example showing how background threads work.
Upgrading to core 0.87.0.
Forgot to remove the comments.
Added AsyncTask example fragment.
Renamed ConcurrencyExample to ServiceExample. Added threadExample to distribution examples.
Merge pull request #645 from realm/kg-core-0.87.0

Upgrading to core 0.87.0.
Merge branch 'master' into cm-concurrency-example

Conflicts:
	examples/concurrencyExample/src/main/java/io/realm/examples/concurrency/ConcurrencyExampleActivity.java
	examples/concurrencyExample/src/main/java/io/realm/examples/concurrency/RealmExampleActivity.java
	examples/serviceExample/src/main/java/io/realm/examples/service/RealmExampleActivity.java
Cleanup preparing for PR.
Merge branch 'master' into cm-concurrency-example
Cleanup autogenerated comments + added missing close to service example.
Handlers are now properly removed when a Realm is closed.
Realm class is now final.
Cleanup handler unit test.
cleaned style
spelling fixed
Update Group.java
Update SharedGroup.java
Merge pull request #653 from realm/cm-rotation-crash

Handlers for closed Realms are now properly removed
Update changelog.txt
Close the Realm instance after a migration