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, 3 insertions, 3 deletions

diff --git a/blame_test.go b/blame_test.go
index 0b2126d..855e1fc 100644
--- a/blame_test.go
+++ b/blame_test.go
@@ -26,7 +26,7 @@ func (s *BlameSuite) TestBlame(c *C) {
 		r := s.NewRepositoryFromPackfile(fixtures.ByURL(t.repo).One())
 
 		exp := s.mockBlame(c, t, r)
-		commit, err := r.Commit(plumbing.NewHash(t.rev))
+		commit, err := r.CommitObject(plumbing.NewHash(t.rev))
 		c.Assert(err, IsNil)
 
 		obt, err := Blame(commit, t.path)
@@ -36,7 +36,7 @@ func (s *BlameSuite) TestBlame(c *C) {
 }
 
 func (s *BlameSuite) mockBlame(c *C, t blameTest, r *Repository) (blame *BlameResult) {
-	commit, err := r.Commit(plumbing.NewHash(t.rev))
+	commit, err := r.CommitObject(plumbing.NewHash(t.rev))
 	c.Assert(err, IsNil, Commentf("%v: repo=%s, rev=%s", err, t.repo, t.rev))
 
 	f, err := commit.File(t.path)
@@ -48,7 +48,7 @@ func (s *BlameSuite) mockBlame(c *C, t blameTest, r *Repository) (blame *BlameRe
 
 	blamedLines := make([]*Line, 0, len(t.blames))
 	for i := range t.blames {
-		commit, err := r.Commit(plumbing.NewHash(t.blames[i]))
+		commit, err := r.CommitObject(plumbing.NewHash(t.blames[i]))
 		c.Assert(err, IsNil)
 		l := &Line{
 			Author: commit.Author.Email,