Merge pull request sirupsen#1244 from sirupsen/dbd-release

update changelog

Merge pull request sirupsen#1231 from sirupsen/dbd-cleanup

cleanup

Merge pull request sirupsen#1230 from sirupsen/new-release

update changelog

Merge pull request sirupsen#1145 from sirupsen/custom_buffer_pool

Add an API to plug a custom buffer free item mangement system

update CHANGELOG.md with 1.5.0 and 1.6.0 version contents

Merge pull request sirupsen#1108 from cirelli94/fix-wrong-caller

Fix wrong caller

Release 1.4.2

Release 1.4.1

Merge pull request sirupsen#920 from sirupsen/changelog-v140

Add CHANGELOG for v1.4.0

Merge pull request sirupsen#863 from lugray/generic_log

Add Generic Log functions with level via argument