           keepalive: true
 
     clean:
-      dev: ["release"]
-      release: ["release",]
+      release: ["release"]
       tmp: [ "release/tmp"]
 
     coffee:

  # Start server in preview mode
  grunt.registerTask "preview", [
    "clean:release"
    "clean:tmp"
    "concurrent:release"
    "concurrent:optimize"
    "clean:tmp"

  # Build optimized files
  grunt.registerTask "build", [
    "clean:release"
    "concurrent:release"
    "concurrent:optimize"
    "clean:tmp"
