remove animation upon download completion

* refer to #282
* fixes #282
Merge pull request #285 from hkal/properly_end_download

remove animation upon download completion
Modify sample28.rb and expert-irb-adjusted.rb for #279 specification. Add three adjusted samples in README.
Sample60 crashes and is rather a duplicate of good-reminder.rb

* therefore deleted sample60
* when we make it work again we can just use good-remindero
* [skip ci]