Add libgit2 dir.
Update libgit2
Add support for libgit2 embed.
Add submodule init to setup.py
Add diff options: context_lines and paths.
Add type check for diff option paths.
Fix setup.py for popen
Merge branch 'diff' into code/master
Fix linking git2 order.
Update libgit2 repo url to code.
Merge pull request #1 from xutao/pygit2:libgit2

Update libgit2 repo url to code.
Add additions and deletions for patch.
Merge pull request #2 from xutao/pygit2:diffstat

Add additions and deletions for patch.
Add is_repository method.
Remove double linking libgit2.
Bump libgit2.
Add support libgit2 development.
Fix memory leak.
Merge pull request #5 from xutao/pygit2:libgit2

Bump libgit2.
Bump libgit2.