fix CW update equation: #277
add ChangeLog to binary package
Ensure key_manager to clear resources: refs #280
Ensure storage class to clear resources: refs #280
Merge pull request #285 from y-tag/fix-277

fix CW update equation: #277
update README.rst
Merge branch 'master' into develop
remove mercurial command checking
add ChangeLog to binary package(rpm)