Renaming the Ruby grpc extension to grpc_c, and renaming its loader from loader.rb to grpc.rb
diff --git a/Rakefile b/Rakefile
index 02c9867..ef4c752 100755
--- a/Rakefile
+++ b/Rakefile
@@ -16,7 +16,7 @@
 end
 
 # Add the extension compiler task
-Rake::ExtensionTask.new('grpc', spec) do |ext|
+Rake::ExtensionTask.new('grpc_c', spec) do |ext|
   ext.source_pattern = '**/*.{c,h}'
   ext.ext_dir = File.join('src', 'ruby', 'ext', 'grpc')
   ext.lib_dir = File.join('src', 'ruby', 'lib', 'grpc')