Move backend files to backend/ subdirectory

backend/gulpfile.js

@@ -0,0 +1,21 @@
+const gulp = require('gulp');  
+const mocha = require('gulp-mocha');  
+const nodemon = require('gulp-nodemon');
+
+gulp.task('default', () => {  
+    nodemon({
+        script: './bin/www',
+        ext: 'js',
+        tasks: ['mocha'],
+        env: { 'NODE_ENV': 'development' }
+    })
+});
+
+gulp.task('mocha', () => {  
+    gulp.src(process.cwd() + '/tests/index.js', {read: false})
+    .pipe(
+        mocha({
+            reporter: 'nyan'
+        })
+    );
+});