New in 0.17:

 * Fix 256x256@2/animations name in index.theme

New in 0.16:

 * Add hidpi icon directories (e.g. 48x48@2) with scale=2

New in 0.15:

 * A new icon subdirectory symbolic/apps is available for symbolic
   application icons. It similar to scalable, except it has a target
   design size of 16, which is what symbolic icons use.
