Upgrade version and update changes
Merge branch 'develop' into release/2.5.0
Update CHANGES.rst
Merge tag 'release/2.5.0' into release/2.5.1
changelog updated and version bumped
Merge pull request #201 from mkurek/release/2.5.1

changelog updated and version bumped
Site documentation improvements
usages per device plugin fixed
Merge pull request #202 from mkurek/fix/devices-report-usages-price

usages per device plugin fixed
Merge branch 'develop' of github.com:allegro/ralph_pricing into develop
ceilometer optimization
code review
Merge pull request #203 from inc0/feature/ceilopricing

ceilometer optimization
fixed DirectoryTimedRotatingFileHandler for python < 2.7.6
Merge pull request #204 from mkurek/fix/logging-no-delay

fixed DirectoryTimedRotatingFileHandler for python < 2.7.6
fixed DirectoryTimedRotatingFileHandler for python < 2.7.6
Merge pull request #205 from mkurek/fix/logging-no-delay2

fixed DirectoryTimedRotatingFileHandler for python < 2.7.6
update changes and upgrade version
usage name fix
Merge pull request #206 from inc0/feature/ceilopricing

usage name fix