Fix double commit issue with Resolveable puts. Replace resolveMany' with resolveMany.

Values are `resolved` twice for every resolvable `put`.  This means that if you put a value `a` then what ends up in Riak is `resolve a a`.  This is fine for structures like sets but not so much for other structures.

On reading the documentation I thought the following behavior was described:
    put bucket key a
    -- `a` is now stored in Riak under the bucket key pair bucket, key
    put bucket key a1
    -- `resolve a a1` is now stored in Riak under the bucket key pair bucket, key

The committed files give the above behavior for the small number of by hand tests I have preformed. If this is the preferred behavior I will try and come up with some monadic QuickCheck code to test it.

Here is a code snippet that produces this issue with the current version of the riak package.

    newtype SingularJSON a =   SingularJSON { getSingularJSON :: [a] }          
        deriving (Show, Generic)                                                     
                                                                                 
    deriving instance (FromJSON a) => FromJSON (SingularJSON a)                      
    deriving instance (ToJSON a) => ToJSON (SingularJSON a)                          
                                                                                 
    instance (Resolvable a) => Resolvable (SingularJSON a) where                     
        resolve (SingularJSON [a]) (SingularJSON [b]) = SingularJSON $ [resolve a b] 
                                                                                 
    type SingularSum a = SingularJSON (ResolvableMonoid (Sum a))                     
                                                                                 
                                       
    > let a = SingularJSON . (\x -> [x]) . RM . Sum $ (1::Int)                     
    > withConnection pool $ \conn -> RJ.put conn "test" "test Nothing (a :: SingularSum Int) Default Default                                                
    -- report bacck value of SingularJSON {getSingularJSON = [RM {unRM = Sum {getSum = 2}}]