Add gulp & babel

.babelrc

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+// with options
+{
+  "presets": [
+    [ "env", {
+      "browsers": [
+        "last 2 versions",
+        "ie >= 9",
+        "safari >= 8",
+        "firefox >= 40",
+        "chrome >= 40",
+        "chromium >= 40"
+        ],
+      "modules": false,
+      "debug": true,
+      "useBuiltIns": true
+    }]
+  ]
+}

gulpfile.js

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+'use strict';
+
+const gulp = require('gulp');
+const sass = require('gulp-sass');
+const sassGlob = require('gulp-sass-glob');
+const include = require('gulp-include');
+const order = require('gulp-order');
+const concat = require('gulp-concat');
+const connect = require('gulp-connect');
+const clean = require('gulp-clean');
+const exec = require('gulp-exec');
+const source = require('vinyl-source-stream');
+const runSequence = require('run-sequence');
+const uglify = require('gulp-uglify');
+const rename = require('gulp-rename');
+const pump = require('pump');
+
+gulp.task('clean', function () {
+    return gulp.src('./dist/*', {read: false})
+        .pipe(clean({force: true}))
+});
+
+gulp.task('compress', function (cb) {
+    pump([
+            gulp.src('./dist/bower-opentimestamps.js'),
+            uglify(),
+            rename('bower-opentimestamps.min.js'),
+            gulp.dest('./dist/')
+        ],
+        cb
+    );
+});
+
+gulp.task('index', function() {
+    var options = {
+        continueOnError: false, // default = false, true means don't emit error event
+        pipeStdout: false, // default = false, true means stdout is written to file.contents
+        customTemplatingThing: "test" // content passed to gutil.template()
+    };
+    var reportOptions = {
+        err: true, // default = true, false means don't write err
+        stderr: true, // default = true, false means don't write stderr
+        stdout: true // default = true, false means don't write stdout
+    };
+    return gulp.src('./')
+        .pipe(exec('./node_modules/browserify/bin/cmd.js -r ./src/open-timestamps.js index.js -o ./dist/bower-opentimestamps.es6.js', options))
+        .pipe(exec('./node_modules/babel-cli/bin/babel.js ./dist/bower-opentimestamps.es6.js -o ./dist/bower-opentimestamps.js', options))
+        .pipe(exec.reporter(reportOptions));
+
+    /*NOTE: babelify run babel with .babelrc file, but doesn't convert the code
+    gulp.task('index', function() {
+        return browserify({ debug: true, entries: [" bower-opentimestamps.es6.js"] })
+            .transform(babelify)
+            .bundle()
+            .pipe(source(' bower-opentimestamps.js'))
+            .pipe(gulp.dest('./'));
+    });*/
+});
+
+
+gulp.task('default', function(done) {
+    runSequence('clean', 'index','compress', function(){
+        done();
+    });
+});