Feature/v3 (#225)

* Remove Vue dependency and change extends

Signed-off-by: Jakub Juszczak <netghost03@gmail.com>

* 💎 Release new version 3.0.0-rc0

* ⬆️ Update examples

* 📝 Update README.md

* ⬆️ Update examples

* ⬆️ Update englishd docs

* ⬆️ Update transalted docs with current code examples

* 🔥 Remove dist files from gitignore

* ⬆️ Update dependencies vue and chartjs

* Change private data

Implements #182. The private chart instance is now in the vue.js data model. And can be accessed over `this.$data._chart`
Updated unit tests

* 📝 Update docs with private data

* ✨ Add codeclimate ignore

* ⬆️ Update codeclimate

* ⬆️ Update codeclimate

* ⬆️ Update codeclimate

Add build and config folders to ignore

src/BaseCharts/Scatter.js

@@ -1,8 +1,7 @@
-import Vue from 'vue'
 import Chart from 'chart.js'
 import { mergeOptions } from '../helpers/options'
 
-export default Vue.extend({
+export default {
   render: function (createElement) {
     return createElement(
       'div', {
@@ -48,6 +47,7 @@ export default Vue.extend({
 
   data () {
     return {
+      _chart: null,
       defaultOptions: {
         scales: {
           xAxes: [{
@@ -67,7 +67,7 @@ export default Vue.extend({
     renderChart (data, options) {
       let chartOptions = mergeOptions(this.defaultOptions, options)
 
-      this._chart = new Chart(
+      this.$data._chart = new Chart(
         this.$refs.canvas.getContext('2d'), {
           type: 'scatter',
           data: data,
@@ -78,8 +78,8 @@ export default Vue.extend({
     }
   },
   beforeDestroy () {
-    if (this._chart) {
-      this._chart.destroy()
+    if (this.$data._chart) {
+      this.$data._chart.destroy()
     }
   }
-})
+}