safe for work random cows, MOOOOOO!

I hope this enough to quell the aspirations of ticket #3715, easy to configure specific or random cows and added a "safe for work" option as I've had 'sodomized' in almost every presentation I've given (no, disabling cows is not an option).

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Signed-off-by: Brian Coca <briancoca+dev@gmail.com>