Add support for != in queries on links
Merge pull request #986 from realm/tg-query-not-equal

Add support for != in queries on links
make re-adding an object to the realm it is already in a no-op
changelog
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Merge pull request #991 from realm/al-add-noop

Re-adding an object to its Realm is once again a no-op
Implement sorting arrays by multiple columns at once
Switch to using RLMSortDescriptor for sorting by multiple columns