Capture and display CLI output

[alerque]

Sometimes CLI output is just too verbose to be useful. Other times it actually has helpful information even in the case of successes. Either way it would help to give people a feel for what it is like to use a given engine if they saw the input file, the command use, and any output it gave besides the final product. Capturing the shell output and showing it it at least an expandable mini terminal view would be a nice touch.