Additions
- Added `cowsay` and `cowthink` command line programs.
- Added a `--random` flag to the `cowsay` and `cowthink` programs.
This is a non-standard option, but allows for the easy selection of
random cows.
Changes
- Any string variable declarations in `.cow` files are now inlined in the cow.
- `python-cowsay` now looks for a `COWPATH` environment variable, if found,
the directory this references will be used when loading cows.
- Changed cows back to original cowsay cows.