add setup rake task

give an easy one-command setup for all sources

individual sources can be setup with script/setup/[source]

Rakefile

@@ -2,6 +2,11 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
 
+desc "Run source setup scripts"
+task :setup do
+  Dir["script/setup/*"].each { |script| system(script) }
+end
+
 Rake::TestTask.new(:test) do |t|
   t.libs << "test"
   t.libs << "lib"