[ListItem] List/ListItem glitches

[cgestes]

@hai-cea
Thanks for the really nice List implementation. I noticed some glitches:

• the grey on click animation is misbehaving on phones.
  select an item of the list by clicking, and release the click outside the list item. The grey color get stuck.
• The fadeout (to white) do not exactly finish on phone and the items stay with a very very light grey.
  click an item.

Both can be reproduced with the phone mode of the browser. (chrome, and on my phone it run on cordova (android))