Merge pull request #784 from egbertbouman/small_fixes

Hexlify infohash before logging
Redo the anonymous download test after a Tribler upgrade
Fix channel vote database issue
Merge pull request #792 from egbertbouman/channel_state

Fix channel vote database issue
Merge pull request #791 from egbertbouman/redo_test

Redo the anonymous download test after a Tribler upgrade
Merge pull request #790 from egbertbouman/small_fixes

Disable PEX for anonymous session
Update dispersy ref