Update gulp.

gulpfile.js

@@ -21,7 +21,7 @@ gulp.task('server', function() {
 });
 
 gulp.task('compile', function() {
-    return gulp.src(['src/entities/*.coffee', 'src/main.coffee', 'src/game.coffee', 'src/hud.coffee'])
+    return gulp.src(['src/entities/*.coffee', 'src/tools.coffee', 'src/main.coffee', 'src/game.coffee', 'src/hud.coffee'])
         .pipe(sourcemaps.init())
         .pipe(coffee({bare: true}))
         .pipe(concat('app.js'))