feat(mp-alipay): support subPackages

packages/uni-cli-shared/package.json

 {
     "name": "@dcloudio/uni-cli-shared",
-    "version": "1.0.0-alpha-22120190814002",
+    "version": "0.2.987",
     "description": "uni-cli-shared",
     "main": "lib/index.js",
     "files": [

packages/webpack-uni-pages-loader/lib/platforms/mp-alipay.js

-const path = require('path')
-
 const {
-  parsePages,
-  normalizePath
+  parsePages
 } = require('@dcloudio/uni-cli-shared')
 
 const {
@@ -13,10 +10,10 @@ const {
 
 const pagesJson2AppJson = {
   'globalStyle': function (name, value, json) {
-    json['window'] = parseStyle(value)
-    if (json['window'].usingComponents) {
-      json['usingComponents'] = json['window'].usingComponents
-      delete json['window']['usingComponents']
+    json['window'] = parseStyle(value)
+    if (json['window'].usingComponents) {
+      json['usingComponents'] = json['window'].usingComponents
+      delete json['window']['usingComponents']
     }
   },
   'tabBar': function (name, value, json) {
@@ -34,13 +31,31 @@ function copyToJson (json, fromJson, options) {
 
 module.exports = function (pagesJson, manifestJson) {
   const app = {
-    pages: []
-  }
+    pages: [],
+    subPackages: []
+  }
+
+  const subPackages = {}
 
   parsePages(pagesJson, function (page) {
     app.pages.push(page.path)
-  }, function (root, page) {
-    app.pages.push(normalizePath(path.join(root, page.path)))
+  }, function (root, page, subPackage) {
+    if (!subPackages[root]) {
+      subPackages[root] = {
+        root,
+        pages: []
+      }
+      Object.keys(subPackage).forEach(name => {
+        if (['root', 'pages'].indexOf(name) === -1) {
+          subPackages[root][name] = subPackage[name]
+        }
+      })
+    }
+    subPackages[root].pages.push(page.path)
+  })
+
+  Object.keys(subPackages).forEach(root => {
+    app.subPackages.push(subPackages[root])
   })
 
   copyToJson(app, pagesJson, pagesJson2AppJson)

packages/webpack-uni-pages-loader/package.json

 {
     "name": "@dcloudio/webpack-uni-pages-loader",
-    "version": "0.2.872",
+    "version": "0.2.873",
     "description": "uni-app pages.json loader",
     "main": "lib/index.js",
     "files": [