python: syn: reconnect immediately on EOF
go: pusher: keepalive always
outdated code removal
go: no TCP linger for unresponsive peers
go: try rollback on timeout to avoid disconnect, and do fewer I/O calls
python: TCP keepalive, no Nagle
go: concurrent SendMultipart and Close support
go: type assertion fix
go: improved stats
Merge branch 'master' into dev

Conflicts:
	go/pusher.go
python: implement stats
python: fix
python: linger timeout
Merge branch 'dev'