Merge pull request #4 from terrakuh/dev

Version 0.6.0

Merge pull request #3 from terrakuh/dev

Version 0.5.0

Release v0.4

Fix synchronization

Fix completion handler invocation

Remove easy handle before destruction

Merge pull request #2 from terrakuh/dev

Dev

Merge pull request #1 from terrakuh/dev

Dev

Initial commit