Update core to 0.86.0
Update changelog.txt
Merge remote-tracking branch 'origin/master' into ez-update-core

Conflicts:
	changelog.txt
Little refactor on RealmQuery
Use constant instead of boolean value to make code more readable
Merge pull request #563 from leonardoxh/master

Remove duplicate code in RealmQuery.
Merge pull request #561 from realm/ez-update-core

Update core to 0.86.0
Merge branch 'master' into cm-primary-keys