Make rails5 defailt in bin/* scripts

bin/rails

 #!/usr/bin/env ruby
 # Remove this block when upgraded to rails 5.0.
-unless %w[1 true].include?(ENV["RAILS5"])
+if %w[0 false].include?(ENV["RAILS5"])
   begin
     load File.expand_path('../spring', __FILE__)
   rescue LoadError => e

bin/rake

 #!/usr/bin/env ruby
 # Remove this block when upgraded to rails 5.0.
-unless %w[1 true].include?(ENV["RAILS5"])
+if %w[0 false].include?(ENV["RAILS5"])
   begin
     load File.expand_path('../spring', __FILE__)
   rescue LoadError => e

bin/rspec

@@ -2,7 +2,7 @@
 # Remove these two lines below when upgraded to rails 5.0.
 # Allow run `rspec` command as `RAILS5=1 rspec ...` instead of `BUNDLE_GEMFILE=Gemfile.rails5 rspec ...`
-gemfile = %w[1 true].include?(ENV["RAILS5"]) ? "Gemfile.rails5" : "Gemfile"
+gemfile = %w[0 false].include?(ENV["RAILS5"]) ? "Gemfile.rails4" : "Gemfile"
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../#{gemfile}", __dir__)
 begin