Remove reactive-ruby umbrella file, use reactrb instead

Author: zetachang

lib/generators/reactive_ruby/test_app/templates/assets/javascripts/components.rb

@@ -1,4 +1,4 @@
 require 'opal'
-require 'react'
-require 'reactive-ruby'
+require 'react/react-source'
+require 'reactrb'
 require_tree './components'

lib/generators/reactive_ruby/test_app/templates/test_application.rb.erb

@@ -7,7 +7,7 @@ require File.expand_path('../boot', __FILE__)
 Bundler.require(*Rails.groups(assets: %w(development test)))
 
 require 'opal-rails'
-require 'reactive-ruby'
+require 'reactrb'
 
 <%= application_definition %>
 <% end %>

lib/reactive-ruby.rb

@@ -16,7 +16,7 @@ def ruby?
 if RUBY_ENGINE == 'opal'
   require File.expand_path('../vendor/jquery-2.2.4.min', __FILE__)
   require 'react/react-source'
-  require 'reactive-ruby'
+  require 'reactrb'
   require 'react/test/rspec'
 
   require File.expand_path('../support/react/spec_helpers', __FILE__)