disable -w warnings in test task

Rakefile

@@ -11,11 +11,18 @@ require 'rake/testtask'
 task :default => [:test]
 
 Rake::TestTask.new do |t|
+  # Rake 11 makes warnings on by default, but there is so much noise, including
+  # from our dependencies, and from things I think are silly warnings like
+  # "shadowing outer local variable"
+  # Possibly could turn back on in the future using https://rubygems.org/gems/warning/versions/0.10.0
+  # gem to customize.
+  t.warning = false
+
   t.pattern = 'test/**/*_test.rb'
   t.libs.push 'test', 'test_support'
 end
 
 # Not documented well, but this seems to be
 # the way to load rake tasks from other files
 #import "lib/tasks/load_map.rake"
-Dir.glob('lib/tasks/*.rake').each { |r| import r}
+Dir.glob('lib/tasks/*.rake').each { |r| import r}