Carlos Soriano authored Jan 16, 2015 and Carlos Soriano Sánchez committed Jan 24, 2015

Following a design request and preparing to the port to popovers of
nautilus, we want to use only 3 zoom levels for each kind of view, so
the slider makes sense.

Also, following design guidelines, the new zoom levels sizes for icon
view are 64, 96, 128, with default to 96 and 16, 32, 48 for list view,
32 being the default