refix Feature ZK-2495: When ZK init page, the loading animation runs in a endless loop
Merge pull request #187 from chunfuchang/F70-ZK-2495

refix Feature ZK-2495: When ZK init page, the loading animation runs in ...
refix Feature ZK-2495: ie 8 can't delete window's property
refix Bug ZK-2506: href with mailto: causes session timeout
Merge remote-tracking branch 'Han/refix-B70-ZK-2506'