Prepare tests for prefix changes

We no longer modify the which property, as prefix is applied to every command
now.

Signed-off-by: Tim Smart <tim@fostle.com>
Prefix every command

This prevents permission errors where we can't kill elevated procceses

Signed-off-by: Tim Smart <tim@fostle.com>
Merge pull request #7 from thechurch/prefix-all-commands

Prefix all commands