List: Correct the small/contextual icons.

Move ic_small_accept.png, ic_small_favorite.png and ic_small_upload.png
from res/xhdpi/ to res/drawable-xxhdpi/ because xhdpi action icons
have the same pixel sizes as xxhdpi small/contextual icons:
http://www.creativefreedom.co.uk/icon-designers-blog/android-4-1-icon-size-guide-made-simple/

Generate the other sizes using the Anroid Asset Studio,
using Trim=Trim, Padding=0%, Size=12dip, Padding=2dip.
For instance:
http://romannurik.github.io/AndroidAssetStudio/icons-generic.html#source.type=clipart&source.space.trim=1&source.space.pad=0&source.clipart=res%2Fclipart%2Ficons%2Fav_upload.svg&size=12&padding=2&color=fff%2C100&name=ic_small_upload
Wide layout: Classify: Use the same progress layout part.
List: Add padding to left and right of small/contextual icons.