Bump tutorials to latest pom-imagej parent

This fixes many ImageJ bugs, some of which surface relating to the
tutorials. For example, the using-ops tutorial could not show image
objects produced by ops using the ij.ui().show method.
UsingOps: compute larger demo images
UsingOps: display the image in an ImageJ window

It is only natural to want to do this. Until 2.0.0-rc-8 there were bugs
in ImageJ preventing it from working, but now we can finally do it.
Add another example of Op creation

The "Random Blobs" op is another example of creating and running a new
op. This op takes desired blob size and number of blobs as parameters
and then creates an image using these specifications. The tutorial is
meant to show how ops can aid in image creation.

A main method has been included within the tutorial to allow the user to
output and view the image in the console window as ascii characters.