Upgrading to core 0.87.0.
Forgot to remove the comments.
Merge pull request #645 from realm/kg-core-0.87.0

Upgrading to core 0.87.0.
Merge branch 'master' of github.com:realm/realm-java into kg-logging-jni-calls

Conflicts:
	realm-jni/src/io_realm_internal_SharedGroup.cpp