Squashed commit of the following:

commit 066cc258944d2337eba157dee15292d80c78fc8a
Author: 땡초(엄준일) <umc@coupang.com>
Date:   Sun Mar 2 11:03:57 2014 +0900

    - update to version 1.0.4

commit 20d871807395c464f7c78d1c565af31e8fa0c79b
Author: 땡초(엄준일) <umc@coupang.com>
Date:   Sun Mar 2 11:02:56 2014 +0900

    - fix a feature
    - update samples.