Improve the output css

[paolavrgs]

Add to gulpfile.js a task for indent css after compile_sass

Steps to follow

• Install with npm
  npm install --save-dev gulp-cssbeautify
• Add to gulpfile.js
  var cssbeautify = require('gulp-cssbeautify');
• Into the task compile_sass add:
  .pipe(cssbeautify({ indent: ' ' }))

Right after compile the sass/scss files into css, that .pipe method it's going to indent the css (two spaces).