Adding ability to pass multiple output files to the rake task as ['output.html output.tabs']

lib/brakeman/brakeman.rake

 namespace :brakeman do
 
   desc "Run Brakeman"
-  task :run, :output_file do |t, args|
+  task :run, :output_files do |t, args|
     require 'brakeman'
-    
-    Brakeman.run :app_path => ".", :output_files => [args[:output_file]], :print_report => true
+
+    files = args[:output_files].split(' ')
+    Brakeman.run :app_path => ".", :output_files => files, :print_report => true
   end
 end