[WIP] Updates of the builder backend

.babelrc

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+{
+  "presets": ["es2015", "stage-2"]
+}

package.json

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+{
+  "name": "gitea",
+  "version": "0.9.97",
+  "description": "Gitea - Git with a cup of tea",
+  "license": "MIT",
+  "scripts": {
+    "build": "webpack --progress --optimize-minimize -p --colors"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "@types/jquery.are-you-sure": "^0.0.28",
+    "babel": "^6.5.2",
+    "babel-cli": "^6.18.0",
+    "babel-core": "^6.18.2",
+    "babel-loader": "^6.2.8",
+    "babel-preset-es2015": "^6.18.0",
+    "babel-preset-stage-2": "^6.18.0",
+    "clipboard": "^1.5.15",
+    "codemirror": "^5.21.0",
+    "css-loader": "^0.26.1",
+    "dropzone": "^4.3.0",
+    "emojify": "^1.0.0",
+    "eslint": "^3.11.1",
+    "extract-text-webpack-plugin": "beta",
+    "font-awesome": "^4.7.0",
+    "font-awesome-loader": "^1.0.1",
+    "highlightjs": "^9.8.0",
+    "jquery": "^3.1.1",
+    "jquery-datetimepicker": "^2.5.4",
+    "jquery-minicolors": "^2.1.10",
+    "octicons": "^5.0.1",
+    "pdfjs-dist": "^1.6.377",
+    "postcss": "^5.2.6",
+    "postcss-browser-reporter": "^0.5.0",
+    "postcss-cli": "^2.6.0",
+    "postcss-cssnext": "^2.9.0",
+    "postcss-font-magician": "^1.5.0",
+    "postcss-import": "^9.0.0",
+    "postcss-loader": "^1.2.0",
+    "postcss-reporter": "^2.0.0",
+    "postcss-url": "^5.1.2",
+    "precss": "^1.4.0",
+    "semantic-ui-css": "^2.2.4",
+    "simplemde": "^1.11.2",
+    "style-loader": "^0.13.1",
+    "webpack": "beta",
+    "webpack-closure-compiler": "^2.1.2"
+  }
+}

postcss.config.js

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+const importer = require('postcss-import')
+// const importer = require('postcss-easy-import')
+const customProperties = require('postcss-custom-properties')
+const colorFunctions = require('postcss-color-function')
+const fontMagician = require('postcss-font-magician')
+const nesting = require('postcss-nesting')
+const nested = require('postcss-nested')
+const cssnext = require('postcss-cssnext')
+// const browserReporter = require('postcss-browser-reporter')
+// const reporter = require('postcss-reporter')
+
+function postcssConfig (webpack) {
+  return [
+    importer({
+      path: [
+        './public',
+        './node_modules'
+      ],
+      addDependencyTo: webpack
+    }),
+    customProperties,
+    colorFunctions,
+    fontMagician,
+    nesting,
+    nested,
+    cssnext
+  ]
+}
+
+module.exports = postcssConfig