Merge pull request #13 from boudewijn-tribler/dimitra-master

Barterecast uses :memory: db When Dispersy does.
Merge pull request #14 from boudewijn-tribler/dimitra-master

Walks that do not occur are also logged.
Merge pull request #15 from boudewijn-tribler/dimitra-master

Dimitra master
new community
new community