Removed temporarily downloadapp until the slider issue is fixed.

This is related with #896. 
Currently the example needs a really bad hack to work properly, so we decided so remove it temporarily until #896 get fixed. We can bring the example back into master after solving the issue. It makes no sense to ship not working example on master or release. @kdodia @chdoig @bryevdv and me agreed on the removal, so I will merge this one immediately after tests passed.