manifest.json should be copied via npm for now

- angular cli's lack of ability to do this at the moment is fixed in
  future builds: angular/angular-cli#2570

Author: wangbus

package.json

@@ -9,7 +9,7 @@
     "test": "ng test",
     "pree2e": "webdriver-manager update",
     "e2e": "protractor",
-    "compress": "cp manifest.json dist/ && cd dist && zip -r -X $npm_package_name-$npm_package_version.zip ."
+    "compress": "cp src/manifest.json dist/ && cd dist && zip -r -X $npm_package_name-$npm_package_version.zip ."
   },
   "private": true,
   "dependencies": {

manifest.json renamed to src/manifest.json

@@ -8,10 +8,6 @@
   "browser_action": {
     "default_popup": "index.html"
   },
-  "background": {
-    "page": "background.html",
-    "persistent": false
-  },
   "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
   "icons": {
     "128": "assets/icon_128.png",