eat(core): use npm commands

* feat(core): use npm commands

Replace variety of commands by npm commands.

See #1258

* Remove prestart

* Move bower --config.interactive=false to .bowerrc

.bowerrc

@@ -1,3 +1,4 @@
 {
-  "directory": "public/lib"
+  "directory": "public/lib",
+  "interactive": false 
 }

package.json

@@ -15,9 +15,19 @@
     "npm": ">=2.0.0"
   },
   "scripts": {
-    "start": "grunt",
-    "test": "grunt test",
-    "postinstall": "bower install --config.interactive=false"
+    "update": "npm update && npm prune && bower install --allow-root && bower prune --allow-root",
+    "start": "gulp",
+    "start:prod": "gulp prod",
+    "start:debug": "gulp debug",
+    "lint": "gulp lint",
+    "test": "gulp test",
+    "test:server": "gulp test:server",
+    "test:client": "gulp test:client",
+    "test:e2e": "gulp test:e2e",
+    "test:watch": "gulp test:server:watch",
+    "test:watch:onlyChanged": "gulp test:server:watch --onlyChanged",
+    "postinstall": "bower install --allow-root && bower prune --allow-root",
+    "generate-ssl-certs": "scripts/generate-ssl-certs.sh"
   },
   "dependencies": {
     "acl": "~0.4.9",