Add dep for task `gulp scripts:watch`
Add dep for task `gulp scripts:watch`

With Webpack (ES6) `gulp watch` use 'scripts:watch'  and 'scripts'
These two tasks inject module preloader and loader to `.tmp/serve/app/index.js`

To fix #457 gulp should wait the end of 'scripts' before launch 'scripts:watch'

groupe-sii/generator-gulp-angular,groupe-sii/generator-gulp-angular,groupe-sii/generator-gulp-angular,groupe-sii/generator-gulp-angular