Clean up simplecov reporting

spec/spec_helper.rb

@@ -3,6 +3,10 @@ if ENV["rscons_dist_specs"]
 else
   require "simplecov"
 
+  class MyFormatter
+    def format(*args)
+    end
+  end
   SimpleCov.start do
     add_filter "/spec/"
     add_filter "/.bundle/"
@@ -14,6 +18,7 @@ else
     add_filter "test/rscons.rb"
     project_name "Rscons"
     merge_timeout 3600
+    formatter(MyFormatter)
   end
 
   require "rscons"