Add a stock icon for indicate previews on dashboard.
Add a stock icon for indicate previews on dashboard.

The icon belongs to Deleket (Jojo Mendoza) whose website is
http://www.deleket.com. Attributed to him as required by the license,
CC Attribution-Noncommercial-No Derivate 3.0. There is no derivation
from the original icon and since Melange is an open source project
which is not used for any commercial purpose, we satisfy all the
requirements on the license.

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son