perf: Lift the required browser versions

As of https://caniuse.com/#feat=mdn-javascript_builtins_function_bind Function.bind
is supported in IE +9, Edge +12 , Firefox +4, Chrome +7, Safari +5.1.

ScheduleCreationPopup._onClickListeners() uses Function.bind since April 2018, and
TimeCreationGuide._onDrag uses it since Mai 2017, so the aforementioned browser
versions are required that long.

• Replace util.bind(x,y) with x.bind(y)
• Update README.md with the minimal supported versions.

README.md

@@ -238,7 +238,7 @@ $('#calendar').tuiCalendar({
 ## 🌏 Browser Support
 | <img src="https://user-images.githubusercontent.com/1215767/34348387-a2e64588-ea4d-11e7-8267-a43365103afe.png" alt="Chrome" width="16px" height="16px" /> Chrome | <img src="https://user-images.githubusercontent.com/1215767/34348590-250b3ca2-ea4f-11e7-9efb-da953359321f.png" alt="IE" width="16px" height="16px" /> Internet Explorer | <img src="https://user-images.githubusercontent.com/1215767/34348380-93e77ae8-ea4d-11e7-8696-9a989ddbbbf5.png" alt="Edge" width="16px" height="16px" /> Edge | <img src="https://user-images.githubusercontent.com/1215767/34348394-a981f892-ea4d-11e7-9156-d128d58386b9.png" alt="Safari" width="16px" height="16px" /> Safari | <img src="https://user-images.githubusercontent.com/1215767/34348383-9e7ed492-ea4d-11e7-910c-03b39d52f496.png" alt="Firefox" width="16px" height="16px" /> Firefox |
 | :---------: | :---------: | :---------: | :---------: | :---------: |
-| Yes | +9 | Yes | Yes | Yes |
+| +7 | +9 | Yes | +5.1 | +4 |
 
 ## 🔧 Pull Request Steps
 

src/js/common/autoScroll.js

@@ -148,7 +148,7 @@ AutoScroll.prototype._onMouseDown = function(mouseDownEvent) {
     }
 
     window.clearInterval(this._intervalID);
-    this._intervalID = window.setInterval(util.bind(this._onTick, this), SCROLL_INTERVAL);
+    this._intervalID = window.setInterval(this._onTick.bind(this), SCROLL_INTERVAL);
 
     domevent.on(global, {
         'mousemove': this._onMouseMove,

src/js/common/reqAnimFrame.js

@@ -4,7 +4,6 @@
  */
 'use strict';
 
-var util = require('tui-code-snippet');
 var requestFn,
     cancelFn;
 
@@ -40,7 +39,7 @@ module.exports = {
      * @returns {number} Unique id
      */
     requestAnimFrame: function(fn, context) {
-        return requestFn.call(global, util.bind(fn, context));
+        return requestFn.call(global, fn.bind(context));
     },
 
     /**

src/js/factory/controller.js

@@ -20,7 +20,7 @@ function mixin(from, to, propertyName) {
     var obj = to[propertyName] = {};
 
     util.forEach(from, function(method, methodName) {
-        obj[methodName] = util.bind(method, to);
+        obj[methodName] = method.bind(to);
     });
 }
 

src/js/handler/time/core.js

@@ -49,7 +49,7 @@ var timeCore = {
         /**
          * @param {MouseEvent} mouseEvent - mouse event object to get common event data.
          * @param {object} [extend] - object to extend event data before return.
-         * @returns {object} - common event data for time.*
+         * @returns {object} - common event data for time
          */
         return function(mouseEvent, extend) {
             var mouseY = Point.n(domevent.getMousePosition(mouseEvent, container)).y,
@@ -80,7 +80,7 @@ var timeCore = {
      * @param {TZDate} startDate - start date
      * @param {TZDate} endDate - end date
      * @param {number} hourStart Can limit of render hour start.
-     * @returns {object} - common event data for time.* from mouse event.
+     * @returns {object} - common event data for time from mouse event.
      */
     _retriveScheduleDataFromDate: function(timeView, startDate, endDate, hourStart) {
         var viewTime = timeView.getDate();

src/js/view/week/timeGrid.js

@@ -545,7 +545,7 @@ TimeGrid.prototype.attachEvent = function() {
     clearTimeout(this.timerID);
     this.intervalID = this.timerID = this.rAnimationFrameID = null;
 
-    this.timerID = setTimeout(util.bind(this.onTick, this), (SIXTY_SECONDS - new TZDate().getSeconds()) * 1000);
+    this.timerID = setTimeout(this.onTick.bind(this), (SIXTY_SECONDS - new TZDate().getSeconds()) * 1000);
 
     domevent.on(this.stickyContainer, 'click', this._onClickStickyContainer, this);
 };
@@ -600,7 +600,7 @@ TimeGrid.prototype.onTick = function() {
     }
 
     if (!this.intervalID) {
-        this.intervalID = setInterval(util.bind(this.onTick, this), HOURMARKER_REFRESH_INTERVAL);
+        this.intervalID = setInterval(this.onTick.bind(this), HOURMARKER_REFRESH_INTERVAL);
     }
     this.refreshHourmarker();
 };