version bump to 2.7.1

Merge pull request roo-rb#368 from roo-rb/refactoring_simplifying_cla…

…sses

Refactoring simplifying classes

Update to versin 2.6.0

version 2.5.1

Merge branch 'master' of github.com:roo-rb/roo

Update to version 2.4.0

Bump version to 2.3.2

Bump to version 2.3.1

Version bump to 2.3.0

Bump to version 2.2.0