perf(async/await): Removed async/await in favour of ES6 promises

closes #117

Author: ritz078

.babelrc

@@ -1,4 +1,3 @@
 {
-    presets:['es2015-rollup','stage-2'],
-    plugins:['transform-regenerator']
+    presets:['es2015-rollup']
 }

Gruntfile.js

@@ -36,7 +36,7 @@ module.exports = function(grunt) {
             },
             js: {
                 files: ['src/js/**/*.es6', 'build.json', 'src/js/vendor/*.js'],
-                tasks: ['eslint', 'rollup', 'uglify']
+                tasks: ['eslint', 'shell:rollup', 'uglify']
             }
         },
 

demo/index.html

@@ -39,9 +39,7 @@
     "babel": "^6.3.26",
     "babel-core": "^6.4.0",
     "babel-eslint": "^4.1.6",
-    "babel-plugin-transform-regenerator": "^6.4.4",
     "babel-preset-es2015-rollup": "^1.1.1",
-    "babel-preset-stage-2": "^6.3.13",
     "chai": "^3.2.0",
     "commitizen": "^2.5.0",
     "cssnano": "^3.4.0",