upgrade mail plugin from v0.9.1 to v1.0.0
upgrade mail plugin from v0.9.1 to v1.0.0

- fix mail port bug (https://github.com/nforge/yobi/issues/575)

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