Fix NPE (when no previous value)

Signed-off-by: L5D <L5D@L5D-PC>
Merge pull request #585 from L5D/master

Fix NPE (when no previous value)
Add protocol handlers
Signed-off-by: Karang <arthur.hennequin@free.fr>
Merge pull request #586 from Karang/master

Add protocol handlers
More protocol

Signed-off-by: L5D <L5D@L5D-PC>
Merge pull request #587 from L5D/master

More protocol
Start parsing the chunk packets.

Signed-off-by: Karang <arthur.hennequin@free.fr>
Merge pull request #588 from Karang/master

Start parsing the chunk packets.