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

4 files changed, 4 insertions, 4 deletions

diff --git a/_examples/clone/main.go b/_examples/clone/main.go
index 27d043b..4a5efa2 100644
--- a/_examples/clone/main.go
+++ b/_examples/clone/main.go
@@ -28,7 +28,7 @@ func main() {
 	ref, err := r.Head()
 	CheckIfError(err)
 	// ... retrieving the commit object
-	commit, err := r.Commit(ref.Hash())
+	commit, err := r.CommitObject(ref.Hash())
 	CheckIfError(err)
 
 	fmt.Println(commit)
diff --git a/_examples/log/main.go b/_examples/log/main.go
index da856ac..165cfa9 100644
--- a/_examples/log/main.go
+++ b/_examples/log/main.go
@@ -30,7 +30,7 @@ func main() {
 	CheckIfError(err)
 
 	// ... retrieves the commit object
-	commit, err := r.Commit(ref.Hash())
+	commit, err := r.CommitObject(ref.Hash())
 	CheckIfError(err)
 
 	// ... retrieves the commit history
diff --git a/_examples/open/main.go b/_examples/open/main.go
index 9174588..d4b54dc 100644
--- a/_examples/open/main.go
+++ b/_examples/open/main.go
@@ -25,7 +25,7 @@ func main() {
 	CheckIfError(err)
 
 	// ... retrieving the commit object
-	commit, err := r.Commit(ref.Hash())
+	commit, err := r.CommitObject(ref.Hash())
 	CheckIfError(err)
 
 	// ... calculating the commit history
diff --git a/_examples/showcase/main.go b/_examples/showcase/main.go
index 82c2acf..aa99421 100644
--- a/_examples/showcase/main.go
+++ b/_examples/showcase/main.go
@@ -39,7 +39,7 @@ func main() {
 	CheckIfError(err)
 
 	// ... retrieving the commit object
-	commit, err := r.Commit(ref.Hash())
+	commit, err := r.CommitObject(ref.Hash())
 	CheckIfError(err)
 	fmt.Println(commit)