Task<RiakCounterResult> IncrementCounter(
	string bucket,
	string counter,
	long amount,
	RiakCounterUpdateOptions options = null
)

abstract IncrementCounter : 
        bucket : string * 
        counter : string * 
        amount : int64 * 
        ?options : RiakCounterUpdateOptions 
(* Defaults:
        let _options = defaultArg options null
*)
-> Task<RiakCounterResult>