Fix/spec output

Trivial changes to the rspec code to remove warnings, allow command-line options, and restore proper coverage counting (turns out we're not *quite* at 100%, will address in future PRs).

Finished in 1 minute 18.23 seconds
703 examples, 0 failures, 4 pending
Coverage report generated for RSpec to /Users/aweiner/the_policy_machine/coverage. 613 / 618 LOC (99.19%) covered.