git: Repository methods changes

To have a more consistent public API, we decided to rename some methods, and add others:

- Commit method renamed to CommitObject
- Commits method renamed to CommitObjects
- Tree method renamed to TreeObject
- Trees method renamed to TreeObjects
- Tags method renamed to TagObjects
- Tag method renamed to TagObject
- Added method Tags that returns tag references
- Added method Branches that returns branch references
- Added method Notes that returns note references
- Added BlobObject method
- Added BlobObjects method

Also, we added more functionality related to references:
- Added iterator to iterate References with a specific filter

Some notes:
- #298

1 files changed, 1 insertions, 1 deletions

diff --git a/worktree.go b/worktree.go
index 36b17b6..1a1661a 100644
--- a/worktree.go
+++ b/worktree.go
@@ -34,7 +34,7 @@ func (w *Worktree) Checkout(commit plumbing.Hash) error {
 		return ErrWorktreeNotClean
 	}
 
-	c, err := w.r.Commit(commit)
+	c, err := w.r.CommitObject(commit)
 	if err != nil {
 		return err
 	}