iterate through relations if paginated

[ghost]

This PR allows returning link to relationship as an iterator. replace #10

see #6

[coveralls]

Coverage decreased (-0.1%) to 85.816% when pulling 567cbed on ola-t:iterator_relation into d3353b7 on qvantel:master.

[ghost]

Would you think it possible to change this to be a new feature? I mean by adding for example a key word parameter to Session such as "return_link_relationship_as_iterator" and defaulting to False. Then add if-else to this LinkRelationship class accordingly. This would ensure backward compatibility. What do you think?

@ajjn does this work now for you?

[ajjn]

Yeah, that's great! Thanks for your contributions!

[ghost]

When this patch could be released, roughtly?

[ghost]

I didnt expect merging that so quickly, would you consider better name for return_link_relationship_as_iterator like relationship_iterator ? (Sorry, should ask before)