Recalculate secondary dependencies between rounds #378
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Previously dependency constrains were only added between rounds of
resolving dependencies.
This could cause irrelevant packages to be
present in resulting requirements.txt, e.g. when collecting third-level
dependencies (celery->amqp->vine), when second-level
dependency changes (ampq 2.0.2 -> 1.4.9), 3rd-level requirement (vine)
might remain in resulting output.
So instead of adding new constrains each round and stopping when
there was nothing to add, we replace old constrains with newlely calculated ones
each round and stop when both sets of constrains are identical.
fixes #370