Fix signature dict.
Merge pull request #17 from xutao/ellen:datetime

Fix signature dict.
Fix commit time.
Merge pull request #18 from xutao/ellen:fix

Fix commit time.
add some FIXME
fix archive
add comments to diff
fix commit time
add create_tag
fix create_tag retval
remove asha & bsha
remove change in patch dict
remove filename & new_filename
Remove hunk.mdiff
Merge pull request #19 from lh_intern/ellen:dev

add create_tag
Fix process args.
Merge pull request #21 from xutao/ellen:fix-process

Fix process args.
Merge pull request #20 from xutao/ellen:mdiff

Remove hunk.mdiff
Refine merged commit diff.
Fix merge_base.