Refactor the main app-y bits into a method that can be called more di…

…rectly.

bin/foodcritic

@@ -1,9 +1,3 @@
 #!/usr/bin/env ruby
 require_relative "../lib/foodcritic"
-module FoodCritic
-  cmd_line = CommandLine.new(ARGV)
-  review, status = Linter.run(cmd_line)
-  printer = cmd_line.show_context? ? ContextOutput.new : SummaryOutput.new
-  printer.output(review)
-  exit status.to_i
-end
+exit FoodCritic::CommandLine.main

lib/foodcritic/command_line.rb

@@ -1,6 +1,15 @@
 module FoodCritic
   # Command line parsing.
   class CommandLine
+    def self.main(argv=ARGV, out=$stdout)
+      cmd_line = CommandLine.new(argv)
+      review, status = Linter.run(cmd_line)
+      printer = cmd_line.show_context? ? ContextOutput.new(out) : SummaryOutput.new(out)
+      printer.output(review)
+      status.to_i
+    end
+
+
     # Create a new instance of CommandLine
     #
     # @param [Array] args The command line arguments