Merge pull request #16 from 130s/hydro-devel

Title corrected (not sure how it got messed up). This is a fix to https://github.com/start-jsk/densowave/issues/12. And I'm merging.
CHANGELOG.rst for 0.2.6
"0.2.6"
Fix https://github.com/start-jsk/denso/issues/14
Update CHANGELOG.rst for 0.2.7