Combiner should return Iterable<M> instead of M or null.

                 Key: GIRAPH-124
             Project: Giraph
          Issue Type: Improvement
          Components: graph
    Affects Versions: 0.1.0
            Reporter: Claudio Martella

Currently VertexCombiner is expected to return a single message combining the 
input messages, or null in case no message should be sent. The new expected 
interface should return an Iterable<M>, possibly empty. The number of elements 
in the returned Iterable is supposed to be smaller than the number of input 
messages, by the initial definition of a Combiner (defined as a function to 
reduce I/O by combining multiple messages into 1).

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