Squashed commit of the following:

commit 8bfef1e71a1e4d93d240e60f77e656d51e10a0eb
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Wed Dec 18 07:00:35 2013 +0900

    Snapshot of 2013.12.18

    - check length of a jQuery object
    - using css('width') instead of width()

commit 6bee8f15f942d29acc575d2f1f9b45ffce550540
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Sun Dec 15 20:33:11 2013 +0900

    Snapshot of 2013.12.15

    - support for z-index based themes
    - support for left-margin in percent
    - fixed for a box-sizing related problem
    - the new version number
    - new options are ready

commit bd4f6d72b484d774b35fa63dd2d323f22404a4e8
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Sun Dec 15 00:37:54 2013 +0900

    Code refactoring

    - Refactored for the 2nd sidebar
    - The 2nd sidebar will be available soon :-)

commit 262eb434f5a37827665e3136935388ef0a5cbeae
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Mon Dec 2 09:10:37 2013 +0900

    add comments

commit 98954fff923171b0e4bc51310479ba50f19ea544
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Thu Nov 7 23:14:25 2013 +0900

    [Fixed] disable additional CSS while accordion widgets disabled

    - No longer generate additional CSS while the accordion widgets feature disabled

commit 7a256bedaeddae1aaef85e9c8679d57016fe70ed
Merge: 056d69d cde7783
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Tue Nov 5 13:48:24 2013 +0900

    Merge remote-tracking branch 'origin/master'

commit cde77839b2c9e9e664277d8b70fa8a97d92ed095
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Tue Nov 5 11:50:06 2013 +0900

    Release 1.3

    - using a useful function offsetParent() and other refactoring
    - Japanese resource
    - readme.txt updated

commit e782850d30a328b7655a547ccd637b3d747b7926
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Mon Nov 4 23:59:35 2013 +0900

    [Fixed] take the left margin into calculation

    - Now available for themes with non-zero left margin sidebars

commit a1202f51276d9f877105e078f762770b8ff8b274
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Sun Oct 27 07:53:42 2013 +0900

    delete an unnecessary CSS class

    - delete 'tor-rm'

commit 934996188c1917f7aa561478be9d234ce4d57304
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Sat Sep 7 17:26:16 2013 +0900

    Proportional-width sidebar support

    - added a option to define a sidebar percent-width.

commit 78f5043d052957357e8a4b4a0217d5e7fc7081e6
Author: Hirokazu Matsui <blogger323@gmail.com>
Date:   Tue Aug 27 20:02:27 2013 +0900

    typo corrected

    - Icon -> Icons

git-svn-id: https://plugins.svn.wordpress.org/standard-widget-extensions/trunk@824248 b8457f37-d9ea-0310-8a92-e5e31aec5664