v0.10.53
Update Cool.io dependency to 1.2. fixes #419
Merge pull request #420 from fluent/update-cool.io-to-1.2

Update Cool.io dependency to 1.2. fixes #419
Update msgpack dependency to 0.5
Merge pull request #421 from fluent/update-msgpack-to-0.5

Update msgpack dependency to 0.5
Forget to add blocking_timeout to in_stream. refs #419
Remove older rubygems support
Use v1 configuration by default
Unify License term
Implement Label feature
Replace Engine.emit with router.emit
Add filter feature
match and filter should be initialized with mix order
Output provides router attribute to emit event stream
Fix to cannnot refer rear Label