Fix logging call
Merge pull request #286 from whirm/twisted-callback

Fix logging call
Small fix for main
Shuffle my_preferences
Periodically add bootstrap candidates to communities
Forgot to add insert_trackers to _pending_tasks
Merge pull request #287 from egbertbouman/discoveryV2

Small improvements for DiscoveryCommunity
new_community callback for discovery community
Merge pull request #288 from NielsZeilemaker/discoveryv1.2

new_community callback for discovery community