Mention: fix mentionjs korean bug
Mention: fix mentionjs korean bug

1. change mention.js to 'https://github.com/nforge/Mention.js'
- 45d81732d9 commit by wansoon

oolso/yobi,Limseunghwan/oss,doortts/forked-for-history,ChangsungKim/TestRepository01,brainagenet/yobi,yona-projects/yona,doortts/fork-yobi,Limseunghwan/oss,oolso/yobi,ahb0327/yobi,ihoneymon/yobi,ihoneymon/yobi,Limseunghwan/oss,yona-projects/yona,ihoneymon/yobi,violetag/demo,bloodybear/yona,naver/yobi,ChangsungKim/TestRepository01,doortts/fork-yobi,oolso/yobi,bloodybear/yona,ahb0327/yobi,yona-projects/yona,doortts/forked-for-history,doortts/forked-for-history,doortts/fork-yobi,bloodybear/yona,brainagenet/yobi,bloodybear/yona,brainagenet/yobi,ahb0327/yobi,violetag/demo,naver/yobi,yona-projects/yona,naver/yobi,doortts/fork-yobi