Merge pull request #344 from peterhoeg/master

prefer $XDG_RUNTIME_DIR for pid file and socket

Author: rafaelfranca

lib/spring/env.rb

@@ -32,7 +32,7 @@ def version
     end
 
     def tmp_path
-      path = Pathname.new(Dir.tmpdir + "/spring")
+      path = Pathname.new(File.join(ENV['XDG_RUNTIME_DIR'] || Dir.tmpdir, "spring"))
       FileUtils.mkdir_p(path) unless path.exist?
       path
     end