Merge branch 'develop' into master

Let's start 2012 calendar with separate directory!
Merge branch 'seoulpm-develop' into seoulpm-master
Merge commit 'f7916d766d731e0730f694a5ec4cabc02' into seoulpm-master
Merge branch 'develop' into master
Merge branch 'develop'
Merge branch 'develop'

Now with comments in main page
Merge branch 'develop'

use author's image as fb favicon when possible.
align tooltip title center.
rename author name from h0ney to perlstudy
Merge branch 'develop'
Merge branch 'develop'

Add aanoaa's article
7265ab4: article.css: smaller icon image for deeper than one depth in list
Merge branch 'develop'

Add keedi's article to 3rd day.
Merge branch 'develop'

Add JellyPooo's article in 4th day
Merge branch 'develop'

Add translated version of Jeffrey Kegler's article
for 5th day.
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'