react_on_rails initial generate

Procfile.dev-static

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+# You can run these commands in separate shells
+web: rails s -p 3000
+
+# Next line runs a watch process with webpack to compile the changed files.
+# When making frequent changes to client side assets, you will prefer building webpack assets
+# upon saving rather than when you refresh your browser page.
+# Note, if using React on Rails localization you will need to run
+# `bundle exec rake react_on_rails:locale` before you run bin/webpacker
+webpack: sh -c 'rm -rf public/packs/* || true && bin/webpacker -w'