Adding unit test of RealmQuery.findFirst
Faster implementation of RealmQuery.findFirst
Update RealmQuery.java
Update RealmQuery.java
Update RealmQuery.java
Merge branch 'master' of github.com:realm/realm-java into kg-bug-findfirst

Conflicts:
	changelog.txt
Merge branch 'kg-bug-findfirst' of github.com:realm/realm-java into kg-bug-findfirst
Merge pull request #498 from realm/kg-bug-findfirst

RealmQuery.findFirst - unit test and faster implementation