gulpfile.js

var gulp = require('gulp');
var rev = require('gulp-rev');
var revReplace = require('gulp-rev-replace');
var useref = require('gulp-useref');
var filter = require('gulp-filter');
var uglify = require('gulp-uglify');
var csso = require('gulp-csso');
var autoprefixer = require('gulp-autoprefixer');

gulp.task("index", function() {
  var jsFilter = filter("**/*.js");
  var cssFilter = filter("**/*.css");

  var userefAssets = useref.assets();

  return gulp.src("index.html")
    .pipe(userefAssets)      // Concatenate with gulp-useref
    .pipe(jsFilter)
    .pipe(uglify())             // Minify any javascript sources
    .pipe(jsFilter.restore())
    .pipe(cssFilter)
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(csso())               // Minify any CSS sources
    .pipe(cssFilter.restore())
    .pipe(rev())                // Rename the concatenated files
    .pipe(userefAssets.restore())
    .pipe(useref())
    .pipe(revReplace())         // Substitute in new filenames
    .pipe(gulp.dest('oceanplanning.github.io'));
});

gulp.task('assets', function() {
    return gulp.src(["assets/**/*"])
        .pipe(gulp.dest('oceanplanning.github.io/assets'));
});
gulp.task('static', function() {
    return gulp.src([".htaccess", "favicon.ico", "CNAME"])
        .pipe(gulp.dest('oceanplanning.github.io'));
});

gulp.task("embed", function() {
  var jsFilter = filter("**/*.js");
  var cssFilter = filter("**/*.css");

  var userefAssets = useref.assets();

  return gulp.src("embed.html")
    .pipe(userefAssets)      // Concatenate with gulp-useref
    .pipe(jsFilter)
    .pipe(uglify())             // Minify any javascript sources
    .pipe(jsFilter.restore())
    .pipe(cssFilter)
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(csso())               // Minify any CSS sources
    .pipe(cssFilter.restore())
    .pipe(rev())                // Rename the concatenated files
    .pipe(userefAssets.restore())
    .pipe(useref())
    .pipe(revReplace())         // Substitute in new filenames
    .pipe(gulp.dest('oceanplanning.github.io'));
});

gulp.task('default', [], function() {
    gulp.start('index','embed','static','assets');
});