Merge pull request #318 from netnose/tag-remove

Tag Remove
diff --git a/repository.go b/repository.go
index 77e9f9c..efc506e 100644
--- a/repository.go
+++ b/repository.go
@@ -28,7 +28,7 @@
 	// read, write and delete notes from this repository.
 	Notes NoteCollection
 	// Tags represents the collection of tags and can be used to create,
-	// list and iterate tags in this repository.
+	// list, iterate and remove tags in this repository.
 	Tags TagsCollection
 }
 
diff --git a/tag.go b/tag.go
index 8957430..81d7258 100644
--- a/tag.go
+++ b/tag.go
@@ -83,6 +83,21 @@
 	return oid, nil
 }
 
+func (c *TagsCollection) Remove(name string) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	ret := C.git_tag_delete(c.repo.ptr, cname)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
 // CreateLightweight creates a new lightweight tag pointing to a commit
 // and returns the id of the target object.
 //