Rework white/blacklisting of arguments
make the directory search actually work properly
Move strip_sudo into Command class
Make the command section titles the command itself

use a section of [make] for the make command, instead of a make.conf. And
parse any .conf file in the directory to make this flexible enough.
Check in the general section for the directory directive
Change from pwd to cwd, that's more accurate
Improve option handling for overrides
Properly abstract filter args
Add support for directory substitution
Add rdiff to config file
Drop unnecessary comment in example config
Couple of commends for the example config
Catch an invalid command
Add yum to default config