from pull request 711

from pull request 742

from pull request 743

from pull request 733

from pull request 748

from pull request 749

remove "NanumBarunGothic"
add default font : "맑은 고딕", "Apple SD Gothic Neo"

from pull request 723

fix Code highlighting don't work properly or don't detect the language
- remove legacy code highlighter library (hljs.js), hljs.js origin project is dropped.
- add new code highlighter library (highlighter.js - http://highlightjs.org/)
- new library see the detail - public/javascripts/lib/highlight/README.md

from pull request 745

from pull request 724

from pull request 746

from pull request 727

Now, If one or both of the files are too big to show or get the
difference from them, Yobi show an error message different from
one for the case if the difference is oversized.

This also fixes an error have occured when render small diff of an
oversized file because FileDiff.getError returns A_SIZE_EXCEEDED or
B_SIZE_EXCEEDED if the file is larger than the FileDiff.LINE_LIMIT. If
the diff is not larger than the limit, it should be able to rendered
even if the file is larger than the limit but small enough not to raise
org.eclipse.jgit.errors.LargeObjectException.

And add tests for some exceptional cases.

It was unnecessarily long.

Before:

    [-41, 84, 19, -26, 104, -113, 44, 29, 29, -119, -12, -89, 60, -112, -46, -53]

After:

    11QT5miPLB0difSnPJDSyw==

from pull request 732

from pull request 738

from pull request 729

Cause:
Before referring original issue properties for the first time, to call update() of modifieid issue brings about the issue because of lazy loading.

Solution:
The codes that load original issue properties are moved above calling update() of modified issue.