add windows support

Gemfile.lock

@@ -52,6 +52,7 @@ GEM
 PLATFORMS
   java
   ruby
+  x86-mingw32
 
 DEPENDENCIES
   aws-s3

lib/foreman/process.rb

@@ -30,23 +30,30 @@ private
     defined?(RUBY_PLATFORM) and RUBY_PLATFORM == "java"
   end
 
+  def windows?
+    defined?(RUBY_PLATFORM) and RUBY_PLATFORM =~ /(win|w)32$/
+  end
+
   def fork_with_io(command, basedir)
     reader, writer = IO.pipe
     command = replace_command_env(command)
-    pid = if jruby?
+    pid = if windows?
+      Dir.chdir(basedir) do
+        Process.spawn command, :out => writer, :err => writer
+      end
+    elsif jruby?
       require "posix/spawn"
       POSIX::Spawn.spawn(Foreman.runner, "-d", basedir, command, {
         :out => writer, :err => writer
       })
     else
       fork do
-        trap("INT", "IGNORE")
         writer.sync = true
         $stdout.reopen writer
         $stderr.reopen writer
         reader.close
         exec Foreman.runner, "-d", basedir, command
-      end
+     end
     end
     [ reader, pid ]
   end