Revert "Create a new process group when spawning a new process. This …

…should prevent from SIGINT propagating to spawned processes. (#528)"

This reverts commit 8c003b6.

lib/foreman/process.rb

@@ -49,9 +49,9 @@ def run(options={})
     env    = @options[:env].merge(options[:env] || {})
     output = options[:output] || $stdout
     runner = "#{Foreman.runner}".shellescape
-
+    
     Dir.chdir(cwd) do
-      Process.spawn(env, expanded_command(env), :out => output, :err => output, :pgroup => true)
+      Process.spawn env, expanded_command(env), :out => output, :err => output
     end
   end