for git_merge_tree & git_merge_commits
wrap merge_index & merge_result as dict
assert it is bool
rename format_merge_index
Merge pull request #30 from huanghuang/ellen:merge2

for git_merge_tree & git_merge_commits
do not invoke strip() on None
Merge pull request #31 from penglingbo/ellen:check-arg-type

do not invoke strip() on None
nothing
let fastforward_oid return string not pygit.Oid
fix diff retval
Add is_git_dir.
Merge pull request #33 from lh_intern/ellen:dev

update
add orig_committer since libgit2 fix
Merge pull request #34 from huanghuang/ellen:for_blame

add orig_committer since libgit2 fix
Fix blame binary.
Merge pull request #35 from xutao/ellen:blame

Fix blame binary.
Merge pull request #32 from xutao/ellen:xutao

Add is_git_dir.
Add update_hooks.
Merge pull request #36 from xutao/ellen:hook

Add update_hooks.
Add "revised BSD" license.