Update code base to ES6

Author: Constellation

Diff for: .gitignore

@@ -16,3 +16,6 @@ npm-debug.log
 
 # JSDoc
 /out/
+
+/lib/
+/powered-test/

Diff for: gulpfile.coffee

@@ -0,0 +1,153 @@
+/*
+  Copyright (C) 2014 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+'use strict';
+
+var gulp = require('gulp'),
+    mocha = require('gulp-mocha'),
+    to5 = require('gulp-6to5'),
+    git = require('gulp-git'),
+    bump = require('gulp-bump'),
+    filter = require('gulp-filter'),
+    tagVersion = require('gulp-tag-version'),
+    sourcemaps = require('gulp-sourcemaps'),
+    coffee = require('gulp-coffee'),
+    plumber = require('gulp-plumber'),
+    source = require('vinyl-source-stream'),
+    browserify = require('browserify'),
+    lazypipe = require('lazypipe'),
+    eslint = require('gulp-eslint');
+
+var TEST = [ 'test/*.coffee' ];
+var POWERED = [ 'powered-test/*.js' ];
+var SOURCE = [ 'src/**/*.js' ];
+
+var ESLINT_OPTION = {
+    rules: {
+        'quotes': 0,
+        'eqeqeq': 0,
+        'no-use-before-define': 0,
+        'no-shadow': 0,
+        'no-new': 0,
+        'no-underscore-dangle': 0,
+        'no-multi-spaces': false,
+        'no-native-reassign': 0,
+        'no-loop-func': 0,
+        'no-lone-blocks': 0
+    },
+    settings: {
+        "ecmascript": 6,
+        "jsx": false
+    },
+    env: {
+        'node': true
+    }
+};
+
+var build = lazypipe()
+    .pipe(sourcemaps.init)
+    .pipe(to5)
+    .pipe(sourcemaps.write)
+    .pipe(gulp.dest, 'lib');
+
+gulp.task('build-for-watch', function () {
+    return gulp.src(SOURCE).pipe(plumber()).pipe(build());
+});
+
+gulp.task('build', function () {
+    return gulp.src(SOURCE).pipe(build());
+});
+
+gulp.task('browserify', [ 'build' ], function () {
+    return browserify({
+        entries: [ './lib/index.js' ]
+    })
+    .bundle()
+    .pipe(source('bundle.js'))
+    .pipe(gulp.dest('build'))
+});
+
+gulp.task('powered-test', function () {
+    return gulp.src(TEST)
+        .pipe(sourcemaps.init())
+        .pipe(coffee())
+        .pipe(sourcemaps.write())
+        .pipe(gulp.dest('./powered-test/'));
+});
+
+gulp.task('test', [ 'build', 'powered-test' ], function () {
+    return gulp.src(POWERED)
+        .pipe(mocha({
+            reporter: 'spec',
+            timeout: 100000 // 100s
+        }));
+});
+
+gulp.task('watch', [ 'build-for-watch' ], function () {
+    gulp.watch(SOURCE, [ 'build-for-watch' ]);
+});
+
+// Currently, not works for ES6.
+gulp.task('lint', function () {
+    return gulp.src(SOURCE)
+        .pipe(eslint(ESLINT_OPTION))
+        .pipe(eslint.formatEach('stylish', process.stderr))
+        .pipe(eslint.failOnError());
+});
+
+/**
+ * Bumping version number and tagging the repository with it.
+ * Please read http://semver.org/
+ *
+ * You can use the commands
+ *
+ *     gulp patch     # makes v0.1.0 -> v0.1.1
+ *     gulp feature   # makes v0.1.1 -> v0.2.0
+ *     gulp release   # makes v0.2.1 -> v1.0.0
+ *
+ * To bump the version numbers accordingly after you did a patch,
+ * introduced a feature or made a backwards-incompatible release.
+ */
+
+function inc(importance) {
+    // get all the files to bump version in
+    return gulp.src(['./package.json'])
+        // bump the version number in those files
+        .pipe(bump({type: importance}))
+        // save it back to filesystem
+        .pipe(gulp.dest('./'))
+        // commit the changed version number
+        .pipe(git.commit('Bumps package version'))
+        // read only one file to get the version number
+        .pipe(filter('package.json'))
+        // **tag it in the repository**
+        .pipe(tagVersion());
+}
+
+gulp.task('patch', [ 'build' ], function () { return inc('patch'); })
+gulp.task('minor', [ 'build' ], function () { return inc('minor'); })
+gulp.task('major', [ 'build' ], function () { return inc('major'); })
+
+gulp.task('travis', [ 'test' ]);
+gulp.task('default', [ 'travis' ]);