module Ronn

def self.revision

- 7c short SHA1 for HEAD
- number of commits ahead of
- closest tag name
commit is not tagged, this is a "--" string:
tag name when a tag references the HEAD commit (0.6.25). When the HEAD
The string revision as reported by: git-describe --tags. This is just the

revision: 0.6.25
revision: 0.6.6-5-gdacd74b 
def self.revision
  REV
end