fix(gulp): bangular is too fast, need to slow down. ping gulp-inject?

gulp-inject was totally erasing `index.html` when injection was too
fast.

this commit slow things down, in an ugly way, but it does the job for
the moment.

Author: meriadec

app/templates/gulpfile.js

@@ -117,6 +117,7 @@ gulp.task('watch', ['inject'], function () {
     '!client/filters/**/*.spec.js'
   ], function () {
     gulp.src('client/index.html')
+      .pipe($.wait(100))
       .pipe($.inject(gulp.src(toInject), { relative: true }))
       .pipe(gulp.dest('client'));
   });

app/templates/package.json

@@ -25,6 +25,7 @@
     "gulp-uglify": "^1.1.0",
     "gulp-usemin": "^0.3.11",
     "gulp-util": "^3.0.2",
+    "gulp-wait": "^0.0.2",
     "gulp-watch": "^4.1.0",
     "karma": "^0.12.31",
     "karma-jasmine": "^0.3.5",