Update todoApp to hide the left pane until the right pane is ready to avoid the layout glitch with the left pane being wide then flash to the left side.
Merge remote-tracking branch 'cjolif/master'
Updates to work with FF, can not use e.srcElement, use e.target instead, also can not use  window.event.
Merge pull request #103 from edchat/master

Update todoApp to hide the left pane until the right pane is ready to avoid the layout glitch with the left pane being wide then flash to the left side.