Merge pull request cookpad#77 from VictorAlbertos/remove-gson-dependency

Remove Gson dependency and PureeLog interface

Bump up 4.1.6

Bump up version v4.1.3

Merge pull request cookpad#63 from litmon/bump_up_v4.1.2

Bump up version v4.1.2

Merge pull request cookpad#52 from cookpad/prepare_v4.1.1

v4.1.1

update readme

Merge pull request cookpad#39 from cookpad/release/3.3.0

Release/3.3.0

specify project.version