Add Repository.Log() method (fix #298)

- CommitIter is now an interface
- The old CommitIter implementation is now called StorerCommitIter
- CommitWalker and CommitWalkerPost are now iterators (CommitPreIterator and CommitPostIterator).
- Remove Commit.History() method. There are so many ways to iterate a commit history, depending of the use case. Now, instead of use the History() method, you must use CommitPreIterator or CommitPostIterator.
- Move commitSorterer to references.go because is the only place that it is used, and it must not be used into another place.
- Make References method private, it must only be used into blame logic.
- Added a TODO into references method, where the sortCommits is used to remove it in a near future.

1 files changed, 2 insertions, 8 deletions

diff --git a/plumbing/object/commit_test.go b/plumbing/object/commit_test.go
index 8b4ee2a..c1f49db 100644
--- a/plumbing/object/commit_test.go
+++ b/plumbing/object/commit_test.go
@@ -62,6 +62,8 @@ func (s *SuiteCommit) TestParents(c *C) {
 
 	c.Assert(err, IsNil)
 	c.Assert(output, DeepEquals, expected)
+
+	i.Close()
 }
 
 func (s *SuiteCommit) TestCommitEncodeDecodeIdempotent(c *C) {
@@ -110,14 +112,6 @@ func (s *SuiteCommit) TestNumParents(c *C) {
 	c.Assert(s.Commit.NumParents(), Equals, 2)
 }
 
-func (s *SuiteCommit) TestHistory(c *C) {
-	commits, err := s.Commit.History()
-	c.Assert(err, IsNil)
-	c.Assert(commits, HasLen, 5)
-	c.Assert(commits[0].Hash.String(), Equals, s.Commit.Hash.String())
-	c.Assert(commits[len(commits)-1].Hash.String(), Equals, "b029517f6300c2da0f4b651b8642506cd6aaf45d")
-}
-
 func (s *SuiteCommit) TestString(c *C) {
 	c.Assert(s.Commit.String(), Equals, ""+
 		"commit 1669dce138d9b841a518c64b10914d88f5e488ea\n"+