Slightly improve decode ip/port addresses, doesn't create substrings
anymore
Merge pull request #236 from NielsZeilemaker/improve_conversion

Slightly improve decode ip/port addresses, doesn't create substrings
Double signed message fixes
Fixes for node needed because we moved the SQL queries from member.__init__ to get_member()
Test fixes
Fixes test_sync, debug node now creates a separate community instance
Half of the unit-tests fixed
Redid the Dispersy unit-tests, they are still a mess but at least
running with their own database/dispersy-instance/callback-instance etc.
Removed debug line
Fixes test_crypto, extended test_signature
Also use I for signature replacement
Fix for test_callback
Some more tests fixed
test_bootstrap, test_walker
fix test_signature.test_response_from_node
Fix test_sync.test_last_1_doublemember
`not` not necessary
remove unused imports
cleanup commented out code
Unify signature obtention for bin and sha1 messages
Use a for loop instead of duplicating the code for both keys