Fix the failure of MarkdownAppTest
Fix the failure of MarkdownAppTest

CallAction should be called after the app starts.

This test seems to be broken since we start to use play-2.3. I wonder
why this test passed when we used play-2.1.

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