Add SimpleCov into the mix to get C0 coverage stats.
Update `README.md` to indicate Ruby 1.9 requirement.
Whoops, we don't need this.
Merge pull request #77 from MrJoy/add_coverage_analysis

Add coverage analysis
accept IO-like Gemfile.lock (responds to #read) in Database#initialize
alias `UnpatchedGem#gem` as `UnpatchedGem#rubygem`.