fix(bootstrap): remove ng2-bootstrap

After removing components that have been ported to patternfly-ng, we no longer need the old ng2-bootstrap package.

package.json

@@ -75,8 +75,7 @@
     "@angular/router": "4.0.1",
     "@types/core-js": "0.9.41",
     "angular2-tree-component": "2.7.0",
-    "moment": "2.18.1",
-    "ng2-bootstrap": "1.3.3"
+    "moment": "2.18.1"
   },
   "peerDependencies": {
   },

src/app/app.module.ts

@@ -6,8 +6,6 @@ import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
 import { FormsModule } from '@angular/forms';
 import { HttpModule } from '@angular/http';
 
-import { DropdownModule } from 'ng2-bootstrap/dropdown';
-
 // App components
 import { AppComponent } from './app.component';
 import { AppRoutingModule } from './app-routing.module';
@@ -22,7 +20,6 @@ import { TreeListExampleModule } from './treelist/examples/treelist-example.modu
     AppRoutingModule,
     BrowserAnimationsModule,
     BrowserModule,
-    DropdownModule,
     FormsModule,
     HomeModule,
     HttpModule,

src/app/treelist/examples/treelist-example.module.ts

@@ -2,7 +2,6 @@ import { NgModule }  from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { HttpModule, Http } from '@angular/http';
 
-import { DropdownModule } from 'ng2-bootstrap';
 import { TreeListModule } from '../treelist.module';
 import { TreeModule } from 'angular2-tree-component';
 
@@ -13,7 +12,6 @@ import { TreeListExampleRoutingModule } from './treelist-example-routing.module'
   declarations: [ TreeListExampleComponent ],
   imports: [
     CommonModule,
-    DropdownModule,
     HttpModule,
     TreeListExampleRoutingModule,
     TreeListModule,