Update dispersy ref
Merge pull request #444 from whirm/fixed_number_cache

Update dispersy ref
Startup.
First implementation of metadata community.
small fixes + preparation for experiments.
Add fake db + small fixes for MetadataDB.
Add deleteMetadataMessage method + small fixes.
Change dispersy module URL.
Fix typo.
Fix LastSync call in init message.
Add import.
Add import.
Small fix.
Fix fake DB and small problem.
Small fix.
Small fix.
Small fix.
Fix fake DB.
Fix fake DB.
Fix deleting message problem.