Add eclipse build artifacts to .gitignore
SERVER-2618 Attempting to create a new index that already exists with diff option fails silently
SERVER-8598 hook up CollectionManager in place of ShardChunkManager
SERVER-8598 CollectionManager -> CollectionMetadata refactor, no behavior change
SERVER-8598 preserve semantics of exception-on-conn-failure in trySetVersion
SERVER-8598 minor fixup from review