CSS: make share buttons not wrap on 320px width
CSS: Fix wrap policy of Archive list on footer
HTML: Add meta tag for twitter cards
Grunt: use livereloadx task
CSS: smaller article font size on smart phone
HTML: Modify AdSense code

Recently, modifying AdSense code are permitted.
http://adsense.blogspot.jp/2013/05/updates-to-our-modifying-ad-code-policy.html

So, I modified as follows.

Before:
* width > 480px  (PC or tablet):
  1. bottom-left:  Medium Rectangle (300 x 250)
  2. bottom-right: Medium Rectangle (300 x 250)

* width <= 480px (Smartphone):
  1. article top: Medium Rectangle   (300 x 250)
  2. bottom-left: Medium Rectangle   (300 x 250)

After:

* width > 568px (PC or tablet):
  1. bottom-left:  Large Rectangle (366 x 280)
  2. bottom-right: Large Rectangle (366 x 280)

* width <= 568px (Smartphone):
  1. article top: Mobile Leaderboard (320 x  50) [50%] or
                  Medium Rectangle   (300 x 250) [50%]
  2. bottom-left: Medium Rectangle   (300 x 250)
CSS: fix tag styles on smartphone
Grunt: add `build` and `rebuild` command

Now, we use `--future` option to specify build or rebuild.