Repository Commits Get All

Added the logic for getting all commits for a repository including unit
tests and XML docs
Get All repo commits with request parameters

Implemented Get All using the available parameters wrapped in a
CommitRequest object.  Added unit tests and xml documentation along the
way.
implement get repository commit

implementation for getting a single repository commit.  Includes
implementation, unit tests and xml docs
reactive unit tests

reactive unit tests
small tidyup
Merge pull request #1 from octokit/master

update from octokit master
Merge branch 'repocommmits'
Merge branch 'master' into repocommmits
tidyup - removing now unused variable
Merge pull request #529 from haagenson/repocommmits

List Commits on a Repository