email sender: rebuild Email send feature with play-email plugins
email sender: rebuild Email send feature with play-email plugins

- replace apache commons to Play-2-Mailplugin
see: https://github.com/schleichardt/Play-2-Mailplugin

- add email send test

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