snortrule usage was missing -r

Somehow I left the -r option out of the usage output on snortrule. Also - when I was testing with rake I ran into this warning:
Warning: you should require 'minitest/autorun' instead.
Warning: or add 'gem "minitest"' before 'require "minitest/autorun"'

I added the gem 'minitest' line ahead of require 'minitest/autorun' per the warning, and that warning cleared. Testbed is Ubuntu 14.04 with ruby 1.9.1 and these gems:
guard-minitest (2.3.2)
minitest (5.4.2)
rake (10.3.2)

I hadn't seen this previously, on my Mac (10.9). Hope this works as intended.