Allow for simple display of GeoTiffs and other images with projected extents

[jpolchlo]

For the common task of simply displaying an image loaded in memory on the map in the geonotebook interface, we must currently have that image in power of two dimension, loaded into an RDD, pyramided, and added to a TMS server. This is many steps for a simple and common task, and may put severe limitations on the permissible inputs based on the power of two restriction. This should be an easy thing to do in one line on arbitrary images, so long as they have a projected extent.

[rossbernet]

I recall this being brought up during RRP. But we didnt assign it as part of tasks this sprint for .2.

Not worth including?

Because I definitely agree that it would be great to be able to view simple images quickly.

[jpolchlo]

There is a solid argument suggesting that this issue would be closed by geotrellis/geonotebook#13. That is, we would be able to utilize the features of Ktile for dealing with simple images. Once we discard the Geotrellis vis server, this route will be available to us.