- Make mcfly's stubbing system a little more fault-tolerant.
- Add a small utility function which redirects print, printError and
write to capture their output, rather than printing to the terminal.
This can then be matched against in order to determine a program's
output.
It's a little flakey - you can't use it multiple times in an it
block, etc... but it's a nice feature.
- Add a small couple of tests to delete as a proof-of-concept.
Actually, many *globs*. It additionally prints the glob if no files
matched it, since that's clearer.
Also move the ComputerTestDelegate's filesystem to be disk-based. This
is what actual computers use, and the MemoryMount is a little broken.
