Vertex reader that reads adjacency lists with no vertex and edge values 

                 Key: GIRAPH-160
             Project: Giraph
          Issue Type: New Feature
          Components: lib
    Affects Versions: 0.1.0
            Reporter: Dionysios Logothetis
            Priority: Minor

A very common format of graphs is adjacency lists with no values associated to 
edges or vertices. For instance a line in the input can be of the type:
1 2 3
which represents a vertex with id 1 that has edges to vertices 2 and 3 with no 
values associated.

I've created a vertex reader named AdjacencyListVertexReader which is 
essentially a copy of the AdjacencyListVertexReader modified to handle this 
format. It's an abstract class and subclasses can override the 
defaultVertexValue() and defaultEdgeValue() methods to provide default values 
for vertices and edges correspondingly (otherwise values are initialized to 

I've also created an example subclass.

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