DRIVERS-149 Some MongoDB 2.6 driver releases may not be able to add users or create indexes with mongos versions before 2.4.0

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DRIVERS-132 Use createIndexes command when available

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CXX-174 Add sparse option to ensureIndex

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SERVER-7464 Allow creation of sparse index in C++ driver by adding sparse flag to ensureIndex(...)

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CXX-157 Add DBClientWithCommands::ensureIndex() overload that takes an options object

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