Port Gelly Graph methods to GraphStreams about gelly-streaming HOT 4 OPEN

I'd like to implement some of these to also start getting a bit familiar with the streaming API.
On which branch are you planning to work on these? Shall we create individual issues for each method or just leave a comment here on what we're working on?

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Right now I'm working on a test branch called graph-representation or something. Should I move to master? Is there a point of having an interface for GraphStream?

I think we can comment here about the functions we want to implement.

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I will work on the merge trees on a different branch probably and merge later ^^

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@balidani, now that we have a clearer model in mind, let's move what we have in the master.
And I don't see a point in the interface, since we're going for edge representation only. We could add this later if needed.

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