Add styling for GFM task lists

Close #2092

Adjust wording

Update CHANGELOG and history

Update Google Universal Analytics to load async (#2079)

Update CHANGELOG

Remove Google+

Google+ is being shutdown on April 2, 2019. Social sharing buttong, comment provider, and author link configs have been removed from the theme.

ref: https://support.google.com/plus/answer/9195133

Loosen Bundler dependency for theme gem

Update CHANGELOG and history

Add missing translation of chinese (#2072)

Add missing Chinese text strings

Release 4.15.2 💎

Update CHANGELOG and history

exit search screen with Esc key (#2055)

* exit search with esc key feature is added
* closing search screen with esc key feature is added to _main.js

Fix bad YAML

Remove comma

Update CHANGELOG and history

Updated swedish translations. (#2056)

Update CHANGELOG and history

update Font Awesome (#2053)

* update Font Awesome

REF: https://fontawesome.com/changelog/latest

* Update _includes/scripts.html

Co-Authored-By: coliff <christianoliff@yahoo.com>

Update CHANGELOG and history

Compile main.min.js

[fix] syntax error of non-english character (#2042)

* Dear the make of one of the world's greatest jekyll theme.

[problem]
I found that
'Syntax Error' occurs when non-english character is included in some html elements(e.g h2, h3 ...) and 'toc' is generated based of that elements.

[debug]
Click the any element of auto generated 'toc' in the below link.
https://aliwo.github.io/swblog/series/principles_of_python/object/#%EA%B0%9D%EC%B2%B4%EC%99%80-%ED%81%B4%EB%9E%98%EC%8A%A4%EC%9D%98-%EC%A0%95%EC%9D%98

[fix]
This happens because escaped url string get right in to jquery. So I fixed it with
javascript's 'decodeURI' function! :)

* rollback unnecessary changes