chore(demos): update demos to work

* chore(demos): WIP refactor gulp demos task to use SystemJS

move build files into dist/demos and comment out the AoT demos task for
right now. This makes both `gulp demos` and `gulp demos.watch`work
again.

references #8411

* docs(demos): fix infinite scroll demo

* chore(demos): move old demos task to demos.prod

update the demos file with shared tasks, include the shared css

* docs(demos): fix API demos to use correct styles

* chore(demos): remove the main.ts files from each demo

* chore(demos): add prod template and constant

* chore(demos): remove tsconfig and package from demos

* chore(demos): update app.module path to ionic

* chore(demos): update app.module path to ionic

* chore(demos): update prod task for demos to work with AoT

also puts the demo build files into dist/ instead of the src directory

* docs(demos): update deploy and docs tasks for new build

* docs(scripts): update demos README

* chore(demos): fix path for prod build

demos/src/segment/app.module.ts

@@ -1,6 +1,98 @@
-import { NgModule } from '@angular/core';
-import { IonicApp, IonicModule } from 'ionic-angular';
-import { ApiDemoApp, ApiDemoPage } from './app.component';
+import { Component, NgModule } from '@angular/core';
+import { IonicApp, IonicModule } from '../';
+
+
+@Component({
+  templateUrl: 'page.html'
+})
+export class ApiDemoPage {
+  appType = 'Paid';
+  safari = 'Shared Links';
+  weather = 'sunny';
+
+  apps = {
+    'Paid': [
+      {
+        name: 'Monopoly',
+        price: '$0.99'
+      },
+      {
+        name: 'Angry Birds',
+        price: '$2.99'
+      }
+    ],
+    'Free': [
+      {
+        name: 'Snapchat',
+        price: 'GET'
+      },
+      {
+        name: 'Instagram',
+        price: 'OPEN'
+      }
+    ],
+    'Top': [
+      {
+        name: 'Spotify',
+        price: 'OPEN'
+      },
+      {
+        name: 'Pandora',
+        price: 'GET'
+      }
+    ]
+  };
+
+  items = {
+    'Bookmarks': [
+      {
+        name: 'Favorites',
+        icon: 'ios-star-outline'
+      },
+      {
+        name: 'History',
+        icon: 'ios-clock-outline'
+      }
+    ],
+    'Reading List': [
+      {
+        name: 'Terms of Service',
+        icon: 'create'
+      },
+      {
+        name: 'User Guide',
+        icon: 'book'
+      }
+    ],
+    'Shared Links': [
+      {
+        name: 'Ionic Framework',
+        icon: 'ionic'
+      },
+      {
+        name: 'Learn Angular',
+        icon: 'logo-angular'
+      }
+    ]
+  };
+
+  getItems(type) {
+    return this.apps[type];
+  }
+
+  getSafariItems(type) {
+    return this.items[type];
+  }
+}
+
+
+@Component({
+  template: '<ion-nav [root]="root"></ion-nav>'
+})
+export class ApiDemoApp {
+  root = ApiDemoPage;
+}
+
 
 @NgModule({
   declarations: [