Merge pull request #18 from luwei0917/Wei_Lu

Wei lu
Merge pull request #19 from luwei0917/Wei_Lu

1st version
Merge pull request #1 from luwei0917/master

hi
Merge pull request #20 from luwei0917/Wei_Lu

1st version
with remove
Merge pull request #21 from kitsuneh/master

a
1st version