don't fork on 'run'

This removes the fork when doing `foreman run`. The fork results in an unnecessary process laying around. The parent process doesn't do anything other than fork and wait for the child to exit.

lib/foreman/cli.rb

@@ -83,7 +83,6 @@ class Foreman::CLI < Thor
       engine.load_procfile(procfile)
     end
 
-    pid = fork do
     begin
       engine.env.each { |k,v| ENV[k] = v }
       if args.size == 1 && process = engine.process(args.first)
@@ -97,9 +96,6 @@ class Foreman::CLI < Thor
       error "command not found: #{args.first}"
     end
   end
-    Process.wait(pid)
-    exit $?.exitstatus
-  end
 
   desc "version", "Display Foreman gem version"