Merge pull request #418 from whirm/move_initiate_meta_messages

Update all Tribler's communities to use the refactored Dispersy
remove the priority stuff as it's not there anymore
update dispersy ref.
Merge pull request #423 from whirm/upstream-dispersy_cleanup

update dispersy ref.
Merge pull request #421 from whirm/incoming_packets_refactor_for_dispersy_cleanup

Incoming packets refactor for dispersy cleanup
update dispersy ref
Updated pointer
Merge pull request #426 from NielsZeilemaker/dispersy_cleanup

Updated pointer
Update reference
Merge pull request #427 from NielsZeilemaker/dispersy_cleanup2

Update reference
update dispersy ref