Merge design renewal branch.

Squashed commit of the following:

commit 0e5bd00043ffe0e8deba53447f998dc4b78da15a
Author: Hideaki Tanabe <tanablog@gmail.com>
Date:   Sun Feb 17 02:32:48 2013 +0900

    Update Google Analytics code.

commit f8121229e63a5d96cb2dd3e2916f3b65924295ae
Author: Hideaki Tanabe <tanablog@gmail.com>
Date:   Sun Feb 17 02:11:07 2013 +0900

    Add copyright.

commit b45120bb56d00f299907c1067a57a84df45ddc2f
Author: Hideaki Tanabe <tanablog@gmail.com>
Date:   Sun Feb 17 01:46:48 2013 +0900

    almost done.

commit 52c2c58c1477a825d5f30ae05412ca4b1d54c31e
Author: Hideaki Tanabe <tanablog@gmail.com>
Date:   Sun Feb 17 00:06:55 2013 +0900

    Imprement core feature.

commit b3ba7989a4dc285d3c15618ea267d29d8d8e6b6a
Author: Hideaki Tanabe <tanablog@gmail.com>
Date:   Fri Feb 15 22:05:59 2013 +0900

    Update libraries