Support Git 1.3
Use MaybeGit
Update Readme
Update Changes
v0.002000

 - Reimplement internals with UtilRole::MaybeGit
 - Update the tests to work on git 1.3, the earliest I can test.

 [Dependencies::Stats]
 - Dependencies changed since 0.001000, see Changes.deps{,.all,.dev} for
   details
 - runtime: +1 -2
 - test: +2